Hi Schulze. I'm glad you're here. You're in a tough place, you recognize the toll it's taken on your mental health, and it sounds like you're ready to try something different.

My question is: how do I be better about not responding/becoming upset when I'm not able to disengage?
To be honest, it sounds like you do a pretty good job of disengaging. You stay calm. Witty comebacks usually aren't helpful but she escalated so quickly, I'm not sure it would have mattered. I'm more concerned about her repeated, unchecked behavior and the toll it's taking on your mental health.
Is this behavior something you can live with long term?
We're here to help you and make sure you feel supported.