Bio mom is wicked witch

She makes me sick. I could go on about all the terrible things she does to me and her own children and yet still has some false sense of herself like she can't do anything wrong. It's turning me into an angry childish person and I don't want to let her do that. I just don't know how to let it bounce off. I feel helpless, like this person is here to make my life miserable and there's nothing I can do.