I would have more of an issue with her criticism and invalidation of your feelings. She should be trying to see the situation from your point of view, as you experienced it. It's your experience. Telling you it's wrong doesn't magically change how you feel.

My T does sometimes apologise but I seem to actually find it pretty meaningless. What matters to me is when he acknowledges what I have experienced and reacts to it, eg "it makes me feel really upset to hear that".

I don't think it's very good that she emailed you like that. I would go for another session and talk to her about all this. It's not about being "wrong" but about how you each experienced the situation.