I left a relationship more than 35 years ago; he was the first guy I ever dated. I basically lost myself focusing on him. There was emotional abuse and physical violence. It took time after I left him to rebuild my sense of self and self worth. You have helped her a great deal, with little in return. Based on my experience, you need to focus on yourself and your needs. Set boundaries. If she asks for help give her your time, but don't offer. You come first. What you need matters, you deserve to be treated well. It is her responsibility to take care of herself, just as yours is to you.