It does sound like you have all sorts of creative ways of dealing with her. Mothers are supposed to be nice. I bet you were a nice mother. She should be too. It isn't right that her daughter should feel this way about her coming to stay for a night. She must have done some dumb stuff to earn that. You wouldn't feel that way for no reason. Parents are supposed to be nice and when they are nice they get nice things back. But when they are mean and nasty and do hurting things of course their kids are not going to want to be around them even when they are grown up! They just remember all the hurt and bad stuff and are scared they are gonna get more of it. She must have done some dumb stuff for you to be feeling so wonky and scared. I know how that feels because I get that way too with my folks. Just remember shes coming for one night and then shes going again okay? Its just one night and maybe some protector ones who are still kind of responsible can be by your side and help you feel stronger and in control. I am sorry you are feeling so bad. I hope you will feel much better once she is gone again.