I would have a talk with her and let her know that I do love her, but would maintain a relationship with her by phone, text, e-mail, or going out to eat or going out places. I think she would know and understand if you said you wanted a relationship, but could not have her back in your home. Her conscience knows what she is doing and why you would say that. And if you maintain the relationship and she seeks help, she will remember who was there for her.