Hey Jabez. I don't know what a Dobson letter is or what the purpose is, but I wouldn't give the letter to her. That's just one girl's opinion, but for what it's worth to ya, there it is. I don't know how much you've been able to validate WAW's feelings, but if you've made any progress there, the above letter will strip that to nothing.
If WAW had the girls for X-mas dinner last year, I would expect that you would have them for X-mas dinner this year. I'm sorry you're going through this. I can only imagine how difficult it is to spend time away from them, especially around the holidays.
Jabez, in your situation, I can see where it would be so tempting to tell yourself that WAW walked out on the family. My H tells me the same thing....that if I leave, I'm walking out on the family. You may not agree with WAW or understand her reasons for leaving, but it seems self-serving to me to tell yourself that being with you most of the time is best for the girls. Is WAW a bad mother? Shuffling around is tough, no doubt about it. But so is being away from people you love. And presumably, your girls love their mother. Are you sure you really feel this arrangement is best or are you just trying to convince yourself it's best? I know that's a tough question and by no means do you have to answer it if you don't want. I'm not trying to make you feel judged. Just think about it.
"Happiness is a butterfly, which, when pursued, is always just beyond your grasp, but which, if you will sit down quietly, may alight upon you."