The book of Esther is about the providence of God over His covenant people.  Out of the events detailed in the book, the Jewish people gain a Festival called the Feast of Purim in which the Jews celebrate God’s actions for them in their behalf while under Persian control.

The main characters are a young Jewish teenager, Esther, and her uncle Mordecai, a wicked royal official of the king, Haman, and the king himself.

Esther was taken from all she knew to join the king’s harem.  After four years of training and beauty treatments, Esther was taken before the king and found favor with him there.  During this time Mordecai waited at the palace gates on word that Esther was ok.  Because of his proximity to the palace Mordecai learned of a plot against the king and Esther was able to warn the king.  He was also the first to warn Esther of a plot by Haman to exterminate the Jews.

“the king’s scribes (secretaries) were summoned on the thirteenth day of the first month, and it was written just as Haman commanded to the king’s satraps (chief rulers), and to the governors who were over each province and to the officials of each people, each province according to its script (writing), each people according to their own language; being written in the name of King Ahasuerus and sealed with the king’s signet ring. Letters were sent by couriers to all the king’s provinces to destroy, to kill and to annihilate all the Jews, both young and old, women and children, in one day, the thirteenth [day] of the twelfth month, which is the month of Adar (March 7, 473 b.c.), and to seize their belongings as plunder.”  Esther 3:10-13 AMP

Mordecai implored Esther to approach the king on behalf of her people that they might be saved from certain death.

Then Mordecai told them to reply to Esther, “Do not imagine that you in the king’s palace can escape any more than all the Jews. For if you remain silent at this time, liberation and rescue will arise for the Jews from another place, and you and your father’s house will perish [since you did not help when you had the chance]. And who knows whether you have attained royalty for such a time as this [and for this very purpose]?”  Esther 4:13-14 AMP

Esther asked of Mordecai that her people would fast in prayer for her before she would approach the king for she feared for her own life too as a consequence for approaching the king without an invitation.

“Go, gather all the Jews that are present in Susa, and observe a fast for me; do not eat or drink for three days, night or day. I and my maids also will fast in the same way. Then I will go in to [see] the king [without being summoned], which is against the law; and if I perish, I perish.”  Esther 4:16 AMP

Esther asked for a fast because she would have been familiar with scripture and had trust in her heart for God.

…They plotted to take away my life. But as for me, I trust [confidently] in You and Your greatness, O Lord; I said, “You are my God.” My times are in Your hands; Rescue me from the hand of my enemies and from those who pursue and persecute me. Psalms 31:13-15 AMP

Yes, she trusted God and would have prayed like Hannah prayed.

Hannah prayed and said, “My heart rejoices and triumphs in the Lord; My horn (strength) is lifted up in the Lord, My mouth has opened wide [to speak boldly] against my enemies, Because I rejoice in Your salvation. There is no one holy like the Lord, There is no one besides You, There is no Rock like our God.                   I Samuel 2:1-2

For, Esther knew and was confident that God is good and gracious and answers those that love Him, call out to Him, and wait on His answer.

Behold, the eye of the Lord is upon those who fear Him [and worship Him with awe-inspired reverence and obedience], On those who hope [confidently] in His compassion and lovingkindness, to rescue their lives from death and keep them alive in famine. We wait [expectantly] for the Lord; He is our help and our shield. For in Him our heart rejoices, because we trust [lean on, rely on, and are confident] in His holy name. Let Your [steadfast] lovingkindness, O Lord, be upon us, in proportion as we have hoped in You.  Psalms 33:18-22 AMP

O Lord, be gracious to us; we have waited [expectantly] for You. Be the arm of Your servants every morning [that is, their strength and their defense], Our salvation also in the time of trouble.  Isaiah 33:2 AMP

She was familiar with the Torah, God’s promises, aligned with His will, purposes, and plans.

“Listen to Me, you who pursue righteousness (right standing with God), Who seek and inquire of the Lord: Look to the rock from which you were cut and to the excavation of the quarry from which you were dug. Look to Abraham your father And to Sarah who gave birth to you in pain; For I called him when he was but one, Then I blessed him and made him many.” For the Lord will comfort Zion [in her captivity]; He will comfort all her ruins. And He will make her wilderness like Eden, and her desert like the garden of the Lord; Joy and gladness will be found in her, Thanksgiving and the voice of a melody. “Listen carefully to Me [says the Lord], O My people, and hear Me, O My nation; For a [divine] law will go forth from Me, And I will quickly establish My justice as a light to the peoples. My righteousness (justice) is near, My salvation has gone forth, And My arms will judge the peoples; The islands and coastlands will wait for Me, and they will wait with hope and confident expectation for My arm. Lift up your eyes to the heavens, then look to the earth beneath; For the heavens will be torn to pieces and vanish like smoke, And the earth will wear out like a garment and its inhabitants will die in like manner. But My salvation will be forever, And My righteousness (justice) [and faithfully fulfilled promise] will not be broken. Listen to Me, you who know righteousness (right standing with God), The people in whose heart is My law and instruction; Do not fear the reproach and taunting of man, nor be distressed at their reviling. For the moth will eat them like a garment, And the worm will eat them like wool. But My righteousness and justice [faithfully promised] will exist forever, And My salvation to all generations.” Awake, awake, put on strength and might, O arm of the Lord; Awake as in the ancient days, as in the generations of long ago. Was it not You who cut Rahab (Egypt) in pieces, Who pierced the dragon [of Egypt]? Was it not You who dried up the [Red] Sea, the waters of the great deep, who made the depths of the sea a pathway for the redeemed to cross over? So the redeemed of the Lord will return and come with joyful shouting to Zion; Everlasting joy will be on their heads. They will obtain gladness and joy, and sorrow and sighing will flee away. “I, even I, am He who comforts you. Who are you that you are afraid of man who dies and of a son of man who is made [as destructible] as grass, that you have forgotten the Lord your Maker, Who stretched out the heavens and laid the foundations of the earth, that you continually tremble with fear all day long because of the rage of the oppressor, as he takes aim to destroy? And where is the rage of the oppressor? The [captive] exile will soon be set free, and will not die in the dungeon, nor will his food be lacking. For I am the Lord your God, who stirs up the sea so that its waves roar—the Lord of hosts is His name. I have put My words in your mouth and have covered you with the shadow of My hand, to establish the [renewed] heavens and lay the foundations of the [renewed] earth, and to say to Zion (Jerusalem), ‘You are My people.’ ”  Isaiah 51:1-16 AMP

Yes, she knew God, and trusted His ways.

When the righteous cry [for help], the Lord hears and rescues them from all their distress and troubles. The Lord is near to the heartbroken And He saves those who are crushed in spirit (contrite in heart, truly sorry for their sin). Many hardships and perplexing circumstances confront the righteous, But the Lord rescues him from them all. He keeps all his bones; Not one of them is broken. The Lord redeems the soul of His servants, and none of those who take refuge in Him will be condemned.  Psalms 34:17-20, 22 AMP

For, in His mysterious ways,

The Lord puts to death and makes alive; He brings down to Sheol (the grave) and raises up [from the grave]. The Lord makes poor and makes rich; He brings low and He lifts up. He raises up the poor from the dust, He lifts up the needy from the ash heap to make them sit with nobles, and inherit a seat of honor and glory; For the pillars of the earth are the Lord’s, And He set the land on them. He guards the feet of His godly (faithful) ones, But the wicked ones are silenced and perish in darkness; For a man shall not prevail by might.  1 Samuel 2:1-2, 6-9 AMP

Therefore, the purposes of the Lord stood firm in Esther’s heart, she requested that her people fast for her, and she approached the king uninvited and received his favor and deliverance for her people.

Then Esther spoke again to the king and fell down at his feet and wept and implored him to avert the evil plot of Haman the Agagite and his plan which he had devised against the Jews [because the decree to annihilate the Jews was still in effect]. Then the king held out to Esther the golden scepter. So Esther arose and stood before the king. Then King Ahasuerus said to Queen Esther and to Mordecai the Jew, “Behold, I have given Esther the house of Haman, and they have hanged him on the gallows because he stretched out his hand against the Jews. Also, concerning the Jews, write as you see fit, in the king’s name, and seal it with the king’s signet ring—for a decree which is written in the king’s name and sealed with the king’s signet ring may not be revoked.” So the king’s scribes were called at that time in the third month (that is, the month of Sivan) on the twenty-third day; and it was written in accordance with everything that Mordecai commanded, to the Jews, to the chief rulers (satraps), and the governors and officials of the provinces which extended from India to Ethiopia (Cush), 127 provinces, to every province in its own script (writing), and to every people in their own language and to the Jews according to their script and their language. He wrote [a decree] in the name of King Ahasuerus, and sealed it with the king’s ring, and sent letters by couriers on horseback, riding on the royal [mail] relay horses, the offspring of the racing mares. In it the king granted the Jews who were in every city the right to assemble and to defend their lives; to destroy, to kill, and to annihilate any armed force that might attack them, their little children, and women; and to take the enemies’ goods as plunder, on one day in all the provinces of King Ahasuerus, the thirteenth [day] of the twelfth month (that is, the month of Adar). A copy of the edict was to be issued as a law in every province and as a proclamation to all peoples, so that the Jews would be ready on that day, to avenge themselves on their enemies.  Esther 8:3-4, 7-13 AMP