This guy was in control of her head since age 15, wasn't he? He was abusive, esp mentally, and after all the years as his wife, I would think she racked up some big mitigating circumstances, esp as it might apply to battered wife syndrome.
The kids, I think, right now are being divided over money issues. There doesn't seem to be much respect for Mom in general. I suspect that is influenced by the father's treatment of her more than it is by her own actions, which might have been more reactionary than anything else.