Do you have any way of reaching out to your T early, email or maybe a phone call? In such situations, it can help to talk about it just a tiny bit in between sessions so that not the whole time is taken up by being angry or hurt.

You say this could be the final straw, has this T in the past done things that bothered you? Were you able to work through those?

If you have an otherwise good relationship with the T, I'd at least see what she thinks about the situation and maybe you're able to work through it. I'll say that my T has at times said stuff that hurt me or were clearly worded badly. Often, he realized right away after the session and was able to explain what was going on for him in that moment. Even Ts slip up sometimes and word something poorly or say something that's maybe not the best. Our brains are also very good at interpreting things the way we "want them to", maybe she perfectly gets that you want to help yourself and just had the wrong phrasing. My T multiple times has asked questions in a way that suggested he had no idea about trauma that we had discussed for multiple years already. Turns out, he's just really bad with words and from all the things he said I am certain he does remember all the things I tell him, he just doesn't have the best linguistic skills.