I am curious to know what your DB coach said about the letter. My coach helped me write one last year. It was a last resort letter.
Also, what has your coach said about your W joining you on a session?
I'd back off on the emails/letters. It seems as though they would validate her decision. Have you apologized for your part already? If so, have you begun to address the issues within your control?
I believe one of the most important, but challenging things to do is to detach.
I know 25 has another example of detachment and sandi2 has an analogy of dropping the rope. Very good info to reference.
Me:45 ExW:48 M:04/97 3 Bombs & 2 ReCons 1st BD 11/10 D Finalized 4/20 D-16 S-14 Going in one more round when you don't think you can. That's what makes all the difference in life.~Rocky Balboa