She got corrupted by joker and having some severe mental instability, becoming a homicidal, sadistic, childlike, and somewhat psychopathic villain, who would use sexuality and her playful personality to achieve her goals or to entertain herself, usually harming others in the process. Harley is also quite tough and pathologically fearless but at the same time is analytical person and manipulative. She is having traumatize childhoods and having toxic environment, which is makes her driving crazy