OP, it will not help you and it might hurt you (my first reaction was 'does the mother NOT want the OP to go away to college- what is the rest of the rec like?!). The question for you is whether removing a possible negative from your app is worth the possibility that your mother will “kill” you. Imo, a college applicant should be able to say "actually, that can come across the wrong way- well off white girls are ORM at many of the schools that I am applying to, so could you change that to (X). But: I don’t know you, your mother or your relationship.