of course it can change if @Christine puts some pressure on it, that's how i managed to convince my father to try it for a year. if i shy away from the discussion then i can't achieve anything. so @Christine put arguments on your mother's table that she also wears a belt, at least as long as she forces you to do so.
your statement is not wrong, but the main reason is that i think interference by the authorities would only make things worse instead of better. i would have gone to the police a long time ago if i thought it would improve my situation.