Oh my god. I'm sorry that happened. But reading this made it sound quite funny. Too bad your therapist felt embarrassed about it, but in a way I also understand.
At the moment when it happens, I guess we all worry about what we just did (to someone). Hopefully she can see the funny part in it soon too. :-)

I do understand you don't want her to feel bad. Never saw my T being embarrassed, but did see T feeling a bit uneasy. It's not nice when it happens.