I think it's a combination of guilt, shame, embarassment and she doesn't want to be seen as a "bad mother" by your D.
It's weird how the WAS's mind works. it's like they feel that they can put stucco on the holes they've left behind. When it would be much easier to replace the wall and start from scratch. They'll come up with any reason in the world to justify their leaving and attack anyone who tells them different.
It's like their moral compass suddenly breaks and what you're left with is an adolescent acting out trapped in an adult's body.
Your W could be in MLC. You can check out that forum where I posted the signs of an MLC if you wanted to see if your W falls in that category.
Good luck man.
stuck
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.