Me (30F) with my friends (33-36F) and their friend/sort of my friend (34F) who used to be my ex-therapist. She mentioned something to the group that I told her during therapy, and that I did not give her permission to share; how do I handle this gracefully?

I was friends with two women who introduced me to their other friend, who ended up being my ex-therapist. I didn't recognize her at first (it had been three years) but a few meetings in I figured it out and I told her it was fine, she was no longer my therapist and I didn't feel uncomfortable hanging out with her.
I'm not her greatest fan. [Some details removed because they aren't relevant to the situation but people are really fixating on them.] That being said, I don't dislike her -- she's just no someone I would organically find in the world because these aren't qualities I seek out in people.
She's gradually made her way into the group and we've done maybe six things together. The issue is last week she mentioned to one friend something that I had told her in confidence during therapy. She didn't do this intentionally; it relates to me basically renting a house from my dad, who I don't have a great relationship with. I don't tell people that I rent a house from my dad because it's 1) a little embarrassing 2) difficult to explain how you can have such a poor relationship with a relative but still be in a situation where you rent from them 3) I typically do not share how "comfortable" my family is with people. I had shared this information with her three years ago in the context of trying to decide if I could remain in the home I rented from him and still establish boundaries. (It turns out I could.)
It's a minor thing, but it's made me realize she probably isn't going to be able to keep straight what I told her three years ago & what she legally can't share due to HIPPA and what I share/talk about her from the time we became "friends." And she frankly doesn't have the emotional intelligence to know what's appropriate to mention and what's not.
I've explained to one friend the situation, making it clear I'm not mad, but I need to nip this in the bud and make a choice that protects both of us, because I probably would pursue legal avenues if she shared anything more sensitive than what she shared about me renting the house. The other friend is much closer to my ex-therapist, and I'm wondering if I just shouldn't tell her anything unless she asks. I'm also curious if I have any obligation or if there would be any problem if I just stepped away from my ex-therapist (declining events I know she will be at, not inviting her to events I host) instead of explaining in writing what I have written up here. Or do I need to tell her, since this is technically a professional issue, not just a personal one?
Thanks.
Edit: Thanks everyone. I did reach out and explain where I was at. I?m not very happy with the response, even though she is understanding: ?I want the clarify that I did not out you. At the party I asked if you rented your house from your parents or someone else. I agree this was related to information I had gained during our working time together. However that is why I asked because I did not know of that was the case. At that time you were welcome to tell us whatever you wanted (true or not). However, I specifically asked you because I did not want to assume or impose.?
TLDR: Became friends with my ex-therapist, she's blabbering on about confidential, protected information I shared with her when I was her client to my other friends.


Source.