The way you can protect your self in an abusive relationship is to tell someone whats going on, tell the police, or just leave from the relationship when you get a chance.
That she has major trauma from the accident and needs on going therapy until the issue can be brought to a bare minimum or to a complete stop.
D) Activity level because the more activity you do, the higher your metabolism which means you lose calories faster which means eventually your consumption of energy a day will increase. Unless you do a lack of exercise in which case you would have a lower consumption of energy without gaining weight when eating.