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If a husband is beating his wife then the wife should shoot him in self defense. If women started doing that then we probably would not be dealing with domestic violence nearly as much today. Instead they chose to start a women's rights movement.

Not to pile on, but women shouldn't murder their husbands. Ever. These commandments are a mercy of God which tell us what injures our souls to the point of no return. Being beaten would suck, but murder injures the murderer's soul mortally, just as adultery injures the adulterer mortally, &c. Secular humanists can't understand these things without the Church, as their "rules" are in terms of physical survival and comfort; but Catholics know these mortal sins make one less able to even want forgiveness, much less able to ask for forgiveness and absolution.

Marriage by definition trumps one's personal comforts and "rights", but if one's husband were truly abusive (not a shove after an argument, but truly abusive), I would hope the wife would do everything in her power to help him (starting with calling the priest, getting rosary intentions for him, whatever it takes).