I agree with Rive. Personally this very strict approach for cancellation (or anything really) didn't work for me, so I found a T who was more flexible. Bit even that had it drawbacks. The thing is, sometimes you just have to take the rough with the smooth, as they say. And your Ts lack of communication and cancellation policy are two very rough areas, but you can't change someone else. All you can do is work out whether they are things worth putting up with.

Not sure if you know my story, and don't want to take over your post, but that is why I did not continue with a lady I was seeing. I could see she was a great T in some areas, but there were too many roughs in the wrong areas.

Anyway, all that said, you should stil feel like you are able to discuss these things, in my opinion. Even if you accept you cannot change them, you have a right to talk about your problems with her, and these are problems. Her saying she "doesn't want to get into an argument" is not a great way of holding her boundaries. She should be able to hold them whilst allowing space for your upset and your anger.

I too would be nervous and worried and want to know what is going on, but we aren't all the same...

I hope that you are staying safe out there!