"Helicopter mom" is the term that came to my mind, too. Sounds like mom is in the panic mode. I assume you are responsible and have not gotten into any trouble, in school or socially, for her to be so hovering and worried. I agree with Miswimmy. Talk to a counselor about it. Even if mom doesn't back off, at least you can get someone else's perspective. I know it's absolutely no consolation, but at least your mom cares. Let's hope she can find a Bridge Club or something else to keep her more occupied.

I'm just wondering: Are you an only child or the baby in the family? Have any other young folks she knows gotten into trouble?