The text s understandable. You're angry and frustrated.
I had to live with my ex fir 4 months until she could move out. We had at the time D1 and S3. I used a combination of the staying board tools to reduce conflct, and leaving board tools to detach. If it's over, it's over, but you still have to have some r/s with her due to the kids.
As hard and as stressful as it is now, what helped me was to think of it like a business: the business of getting her out, and the business of raising kids. It requires both detachment as well as being "present." Tough stuff.
You have a right to be angry, but now it's business as far as she is concerned. There is a tool, BIFF, which can help with texts and emails. I've found it can work verbally as well, at least in my case. BIFF:Brief, Informative, Friendly, Firm.
TOOLS: Responding to hostile emailThis is hard to compartmentalize. You would do well to post legal questions to the Legal Board. Senior members there have experience dealing with high conflict personalities.
How old are your kids, and how are they doing?