I feel like it would be a major disservice to her character for her to have such a sudden change of heart and nature. I would not be entirely opposed to a redemption story for her but I dislike the idea of her becoming shy and submissive given that she's a victim of physical and sexual abuse. It would feel rather distasteful.

I hope that she is faking it, awaiting the right time to strike and attempt to see her vengeance through to the bitter end. It would certain align well with all of her previous speeches regarding vengeance. As it stands, we don't really have any antagonists in the spotlight as of the end of 4.1. At least not any that are close at hand.