User blog comment:IamJakuhoRaikoben/Chapter 484: The Monstrous Six, Review./@comment-168.28.180.15-20160511174154/@comment-5303512-20160511191455

The reason for the hate is for how she doesn't contribute much to the plot. She is just kinda there and doing stuff, though she would not be called a monster by our standards, it appears to be not the case for the characters in the current situation right now despite her previous history, unless something did happen during the timeskip and that can only change when we see these characters can do in the next chapters.