I can't imagine keeping up all that anger she has.
xW has proven that she is now taking after her mother in so many things. Like mother, like daughter,as the say. And as such, I have no doubts she will manage just fine keeping up her anger and blaming her ex-H's for all the misery in her life. MIL has turned that into lifelong pursuit, the only thing she has ever been successful at.
At one time I mourned the loss of the person I once loved to that sad malady that has infected xW's soul. But now, with the D final, even though I do feel a smidgen of compassion for her, I have been freed from thinking her fate is at all my concern any longer. In fact, I now have to look out for my own self -- and my family -- and keep moving forward once again. I do believe that God has taken her and her personal issues out of my concerns from now on. And as you have said, she's done this to herself.