Miswimmy,
Here is my experience with this:

My xT and I came to a point earlier on in therapy where there were a few ruptures. During one of them, I told him, "I have analyzed myself to death and it feels like you are the one who is holding us back. It feels like you want to accept my feelings (neediness) but you can't." He said that , yes, it was him, and that information was really helpful because I kept thinking it was all me. I then learned that relationships were, in fact, a two-way street.

He did tell me point blank that he was having countertransference issues at the end right before I left forever, although I wasn't really sure about much of what was going on then. He had changed his behavior, became much more distant, I was clueless. Was this his unresolved issues that were causing him to be distant? It was shocking to be honest. One day I felt he cared, I did become really stressed he was leaving when his distancing started and my attachment issues escalated, and then I felt he cared no more. I think in order to trust him, he would have had to tell me point blank what was going on, because it eroded my trust in him. This would have happened whether or not he had disclosed information. Changing tactics and not letting the client know is terrifying. Anyway, I don't know if his countransference due to unresolved issues was the main reason he chose not to work with me anymore, and why he pushed me out. (my perception of how things went). I need to understand in order to move on. I need to talk to him and hear it from him. I hope it happens, but I don't think it will. He doesn't want to talk to me

So, that is how therapist disclosure worked out in my relationship. I think it was a positive thing that he disclosed this. The termination part went south because I was dissociated more often than not because it was so jarring, and because I was trying to grasp at straws. But, I don't think it had anything with the disclosure of him having issues (he didn't go into much detail, just a little), it may have been a cause, but the lack of communication during that time is what made it so hard.

I think in therapy you are able to bring up whatever questions you have, just know that she might not want to answer. I wish you the best of luck!