You are caring for her but she is not working out and is too much for you to handle. If she hurts someone, they could sue you. Or what if she knocks you down and you break a couple bones? Or knocks Tom down. Didn't you just say you were both on blood thinners?
There are lots of other dogs. Find one that would be a better fit. You have done a good thing by taking her in. But when you got her, you took a home away from another dog. I know we want to rescue the ones with a sad story or a problem that no one else will deal with. There are other perfectly healthy, happy, friendly, well-mannered dogs out there. They are literally dying for a home. Please find one of those. Let Mutt help you.