Ballast everyone is different. If she's avoidant then her behavior would be expected. Embarrassed / ashamed about everything -- how she's made you feel, breaking up your daughter's family, putting herself in a situation to have a daughter and then getting divorced, etc. etc. She may represent to you that all of this is fine with her, but I guarantee you it isn't.
If you were in her situation *you* might try to communicate in an attempt to free yourself from whatever you're feeling, but she may not react to her feelings in the same way. Her impulse may be to smash them down and avoid them.
Its impossible to mind read the motivation behind her behavior, anything we might guess about it is speculation. Its really not worth comparing her behavior to that of other waywards, because you'd have to compare her to someone else with the same personality, generalized anxiety disorder, etc. etc. and those direct comparisons don't exist.
Acc
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015