There's at least one story in the news every week where a spurned boyfriend or hub kills the woman and the kids, it's a form of temporary insanity.
Come on stop suggesting that she should bend over and allow him to do what he wish to do as you never never get rid of such a jerk by just giving in to what he desire.
He likely picked her out in the first place due to her acting weak and if she for real consider him at all likely to be a danger to herself and her family she should go to the police at once and also have her husband break out the family firearms.
Oh, if it was any of the women in my family the chances that he would see the inside of a courtroom instead of the inside of his own coffin in order to be able to plead temporary insanity.is damn small.
Of course predators be they lions or humans tend to avoid the strong members of a herd and go for the weak ones so her best course of actions is to stop acting so weak.