She was a woman of influence:

That’s one thing God has endowed us with as women. We have the power to influence, turn things around, and also change things. Why do you think Eve was able to persuade her husband to eat the fruit? Yes, we have the power to influence things, but we must learn to use it positively and not negatively.

She influenced her maidens to fast with her when it mattered most. She also through the help of God, influenced her husband to punish and deal with Haman, the enemy of her people.