I didn't (and won't) reply. W had obviously recieved her mail before the text went out to me, so all of our good feelings from the day are basically gone. That is what is too bad about this legal mess we're in. I can only hope more time will allow us to communicate like we were for most of today. I liked that feeling. It was nice.
Enjoy those moments and have no expectations of more--that way you won't be disappointed on the bad days.
She will be angry when she figures out what the letter really means. It is up to her lawyer to manage that--if she gets snotty with you about it, just refer her back to her lawyer.