It is so hard to see your W upset and not try to help. I have been there. I am a fixer also and that is something I have really been working on.
Just some insight from my sitch about your W wanting to go out on her bday. My W says she wants to work on the weekends (she absolutely hates her job) because sitting at home is too depressing and sad and makes her anxious. Maybe it would just be too hard for her to sit home like a "family" given your current sitch.
But I can also see how it makes you feel that W at least doesn't want to be with the kids.
M 37 W 36 T22 M14 D8 D4 8/2012 distanced BD 11/2012 (likely wants D. Feelings have changed.) W move out date: June 8th.