My T encourages me to read her body language. One day she actually asked me to tell her how she was feeling based off of her body language (and I was able to do it).

I do ask my T about her body language or other ways of expression. Why not? And I have no problem asking about it in the next session either.

As for if my T sighed, that would put me into an instant panic. My dad used to sigh when he was angry, and everyone in the house knew to go hide when he did this. So sighing is a huge trigger to me. The rest of what you described would concern me too, but I would address it.