You know all of her other clients and stories by name? Consider then these clients know your story and your name. This so-called therapist is selfishly putting her needs far before yours. This doesn't sound remotely close to therapy. Don't sacrifice your need for therapy because your kind heart doesn't want to offend this woman.

I would run like hell from this person and fast. Trust me, the situation is only going to get worse and leaving will get even harder. Ideas for a gentle therapy break up are to tell her you are concerned for her well-being, to get some help herself, and you'll be moving on, or, tell her you appreciate everything she has done for you but the therapy just isn't working for you. She doesn't sound like a rational person so I suspect that no matter how you break it off with her, she won't take it well. Just remember that you are not responsible for her emotional well-being. It was very unfair and wrong of her to put you in this position to begin with. Don't feel bad for doing what is best for you because so far she has been doing what has been best for her.