Man, let her go. So she misses an appointment? Her responsibility, so she deals with the consequences.
I'm not sure policing her is working for you. I don't think trying to get insider her head is working for you.
Have you ever done that excercise where you make daily gratitude lists?
Each and every day take a few minutes here and there, and make sure you list at least 10 things that you are grateful for in your life right now, in your past, or just in general.
One day, my list's first entry was "Dryer sheets, because they smell good, make my towels soft, and my dogs like playing with them after they've been used". That became a running joke here
I am big on gratitude lists, a daily fitness routine, proper nutrition, and good sleep.
Personally if it were me (and it's not), the way things sound with your X, I'd not worry about her too much at all.
M-47,W-40,No kids D-filed 5/27/2010 Piecing - 10/21/2010 -=Soon to be banned=-