Millie was about to get killed by some pro heroes, as some thought she was a witch, leading to her having multiple quirks..

A little girl with cancer and no hair came up to millie who was currently chained to a wall, pro heroes supervising and some telling the little girl to get away from millie as she was a monster, which caused millie to open her eyes and loook at the little girl

Hawks: “Little girl! Get away from that monster!”