That does sound difficult. It makes things complicated and could be taken on as a burden. It is honest though. And she probably needed to say something, but maybe not in detail. Just something like she needed time off for personal matters without specifying them.

I had a slightly similar issue with my shrink. He told me about his mother's health and I ended up spending time encouraging him to visit her. Then when he decided to, she died. I became more concerned about him than focussing on my treatment. But it was human. He didn't mean to burden me. And it was my own issue of wanting to take care of him like I do with my brother so I learned something. It didn't disrupt anything though.