I can understand being upset knowing that she is taking time off to train a dog. Also it would be frustrating to me that she cancelled the next session for her daughters birthday, she knew about a long time ago. I get that.

My issue would be with her communicating all that to me. I would much prefer more time in advance for the missed session as well as not knowing why. I do recognize some folks want to know what T's do in their spare time. There are many reasons to not know as well.

OP I have understood some previous posts as being problems about communication. This sounds similar in my opinion. It must be challenging having a person for supportive chats but not a therapists who might both communicate less about their own life and keep a more consistant meeting schdule.

It definitely makes sense to take time off. How it's planned and communicated is important in therapy.