The story in the book of Ester happened through the Greek empire 200 BC Ester:3:8

In the book many contradictions are found. A Jewish women marries a pagan king, Jews go to pagan bunquet feasts, in the book Leviticus it says , you will not revenge , in the end of the book of Ester there is a big revenge.

God is acting in  hidden ways, acting in all the chances as everything is by chance: Ester chosen to become queen…the king is reading in the book of memorable deeds where he finds out that Mordachy was not reworded, Ester 6:2

The book of Ester shows a upside down world.