No matter the reason she chose to left, I really can't be mad at her. She was the prototype of a woman that sticks with her man. Bill has had all kinds of allegations swirling around him and it's pretty much known that he was a womanizer and she stuck with him through all of that and even defended him.
So whether she's doing something strategic or whether she's just fed up, I can't really find fault if she wants to take off. It's crazy, but it seems life does come around to eventually spank you for all the stuff you did in the past, just when you think you got away with it. You do indeed reap what you sow.