I'm sorry that happened. I agree with LS, it isn't common, in my experience. People are human, and some people's character defects include gossip, though I don't find that it happens too often outside the group. Anonymity is usually pretty carefully respected. If you know any of the "old timers" at the meeting, you might confide in him/her and chances are someone will have a word with her about the seriousness of anonymity breaches. Ultimately, nobody gets "disciplined" or kicked out of Al-Anon for that kind of behavior (impossible due to the absence of "rules" or "bosses," but it's a real shame when something like this happens.