That stinks. “Terrorist” really? Gosh

Leaving sounds like a great decision. How to do it could depend completely on what you want and need. A cancel next session(s) text with no explanation is fine. If you want to do it in person for any reason, or want to tell her why, how you feel about her as a therapist, defend yourself, give her a piece of your mind etc., then do that. What do you need? How do you need it to end?

Hope you find a better T that’s fits with you better.