My only response was "okay." I was really upset and didn't know what to do. While it was kind crappy to get that via text message, it turned out better in the long run since I was able to respond without emotion reading all over my face.
I probably should have responded as you suggested, but at that moment, I really think that speaking to her would have been a bad idea as I was immediately upset. Luckily, she didn't need to say that.
The weird thing is that the lawyer is a friend of mine's wife. It took everything I had not to call my friend up. But no good would come from dragging him into the middle of it.
One of the hardest things for me is to not crowd her. She has convinced herself that she wants this and I know she will go through with it. I am already focusing myself to shift into the "last resort" method when needed. If it turns out that I don't have to, then great. In the meantime, I'm working through the rest of the DB technique: setting my goals, changing what I can about myself, giving her the space to think, etc. I am trying to stay positive and upbeat, and saving my "true" reactions for people dissociated with her.