I'm sorry you feel so overwhelmed that you had to leave your own home. Try to take some deep breaths and think of your next move. I know that you know deep down that you have to get her out of your house, but since it's obvious that you are stressed there's no need to confront her about it. you either lock the doors and don't let her in or you call the police and meet them outside to remove her. You need to get back to your life and live it the best you can. She will drive you into your grave if you let her.
Praying you can make your move soon.