I sympathise with your problem. It's very difficult when someone you think of as a friend has a different and toxic agenda. We can all trust people with personal info, then regret it. How likely is she to repeat it or has it been forgotten.

Used to work with someone like this. She worked for the government department where I was a contractor. At first she was fine, then not long after showed her true colours. She has health problems (epilepsy, controlled by drugs) but is fit enough to drive. She was loud and overbearing. Fine when talking about her children, but mention anything in your life and instantly disinterested, it was all "me me me". Then the bad language started, the f-word used frequently and she wasn't exactly quiet.

Unfortunately, I got made redundant. No word for eight months. Accidentally bumped into her in local shopping centre. She was on phone but still wanted a hug. I just sidestepped her and said I was in a hurry. Needless to say, nothing heard since!