God! She sounds like torture! Bless your heart for putting up with it.

I think first I would change my phone number, there's no reason that she needs to have your #. If your boyfriend's family needs to get a hold of you for something they can call his phone.

Like others have said, don't engage her. Talk to her only when you have to and don't argue and get into it with her, that's what she's after in the first place.

This woman is obviously mentally unstable. This goes beyond the over protective jealous mother, however she doesn't sound like she's anywhere near admitting she has a problem. The best you can hope for is to avoid her at all costs. Yes, she'll be upset when you change your number but too bad, you need your phone for emergencies not for her to abuse.