As others have said, this is something that may affect you and it seems like it would be productive for you to spend some time and thought about how to handle things if she does come. Questions such as: Will you see her? Will you talk to her? If she comes to your place and you don't want her -- what will you do then? Will it come to the point that you will decide to call the police to get her to leave? What might be the impact of that?

Her behavior and that of the psychologist are their business and it's up to them to decide, even if it's "wrong" by somebody else's standards. It sounds like you have limited influence on their behavior and feelings, but you do, presumably, have influence on your own. I would focus on that, not the other people.