The story of Esther has two sources: the 'Book of Esther' and 'Esther with Additions'. There are important differences between the two: the Book of Esther has no direct reference to God; it does not show Esther obeying the rules of a Jewish woman in her diet, clothes, etc.; the Jewish people behave quite savagely towards their enemies.
Many people were uncomfortable with this, especially with the omission of God. So the 'Additions' were added, providing important prayers to God and toning down the vengeance of the Jewish population. The Additions are accepted by Catholicism and Judaism, but not by Protestant churches.
Esther with Additions, Addition A, Chapter 2
1 After these things,
the king's anger abated, and he no longer was concerned about Vashti or
remembered what he had said and how he had condemned her.
9 The girl pleased him and won his favor, and he quickly provided her with ointments and her portion of food, as well as seven maids chosen from the palace; he treated her and her maids with special favor in the harem.
12 ......Now the
period after which a girl was to go to the king was twelve months.
During this time the days of beautification are completed -- six months
while they are anointing themselves with oil of myrrh, and six months
with spices and ointments for women.
15 When the time was
fulfilled for Esther daughter of Aminadab, the brother of Mordecai's
father, to go in to the king, she neglected none of the things that Gai,
the eunuch in charge of the women, had commanded. Now Esther found favor
in the eyes of all who saw her.
with Additions, Addition C, chapter 14
Esther with Additions, Addition D, chapter 15
1 On the third day,
when she ended her prayer, she took off the garments in which she had
worshiped, and arrayed herself in splendid attire.
3 on one she leaned gently for support,
7 Lifting his face,
flushed with splendor, he looked at her in fierce anger. The queen
faltered, and turned pale and faint, and collapsed on the head of the
maid who went in front of her.
Book of Esther 6:14, 7:1-10, 8:1-2
14 While they were yet talking with him, the king's eunuchs arrived and brought Haman in haste to the banquet that Esther had prepared.
1 So the king and Haman went in to feast with Queen Esther. 2 And on the second day, as they were drinking wine, the king again said to Esther, "What is your petition, Queen Esther? It shall be granted you. And what is your request? Even to the half of my kingdom, it shall be fulfilled." 3 Then Queen Esther answered, "If I have found favor in your sight, O king, and if it please the king, let my life be given me at my petition, and my people at my request. 4 For we are sold, I and my people, to be destroyed, to be slain, and to be annihilated. If we had been sold merely as slaves, men and women, I would have held my peace; for our affliction is not to be compared with the loss to the king." 5 Then King Ahasu-e'rus said to Queen Esther, "Who is he, and where is he, that would presume to do this?" 6 And Esther said, "A foe and enemy! This wicked Haman!" Then Haman was in terror before the king and the queen. 7 And the king rose from the feast in wrath and went into the palace garden; but Haman stayed to beg his life from Queen Esther, for he saw that evil was determined against him by the king. 8 And the king returned from the palace garden to the place where they were drinking wine, as Haman was falling on the couch where Esther was; and the king said, "Will he even assault the queen in my presence, in my own house?" As the words left the mouth of the king, they covered Haman's face. 9 Then said Harbo'na, one of the eunuchs in attendance on the king, "Moreover, the gallows which Haman has prepared for Mor'decai, whose word saved the king, is standing in Haman's house, fifty cubits high." 10 And the king said, "Hang him on that." So they hanged Haman on the gallows which he had prepared for Mor'decai. Then the anger of the king abated
1 On that day King Ahasu-e'rus gave to Queen Esther the house of Haman, the enemy of the Jews. And Mor'decai came before the king, for Esther had told what he was to her; 2 and the king took off his signet ring, which he had taken from Haman, and gave it to Mor'decai. And Esther set Mor'decai over the house of Haman.