Therapy can also be quite private. Perhaps she doesn't want to share. All professional boundaries aside, this situation could also be viewed as a personal boundary as well.

My motto is that if people want me to know something, they'll tell me. I'm just not sure that all things are fair game in our therapy.

Also, I certainly agree with others about the confrontation mindset. It's a discussion for sure, but confrontations rarely end well. It might just have been a word choice though.