Hi Zoo,
So when you go in today, do you best to communicate with your T in the dear man style. In other words, leave all sarcasm and snarkiness out of it to the best of your ability. You do YOUR part to communicate in a respectful and caring way. It will make a difference. It isn't easy to not get defensive, but you can do it.

A big issue is the phone calling. In my opinion, they should be for coaching only and be on some kind of schedule for the sake of consistency. The other type of phone call should be for real emergencies or in the event you feel you might harm yourself. The phone calls for checking in for reassurance should stop. I say that because it would be better for you as well as her. They haven't ended up well in the past from your postings. There needs to be boundaries to feel safe. Even if you feel like you lose something, you will do better and you will get used to it! Plz talk to her about this.

You can also talk about (in a gentle, kind way) how her sarcasm and snarkiness and even cussing (WTF) is very uncomfortable and unsafe for you. By being sarcastic she is not accepting you unconditionally. (part of DBT) My T and I had the same discussion. He is the one who told me about this.

You and your T will get along much better without the sarcasm and you will feel less need to call for reassurance.

Good luck, be honest, ask for what you need, ask for clarification, even ask for time to talk if you need to. You can do this. It is in the calmer times when you want to make a decision about whether to stay or go.