I don't care for "people", I care for one person - my mother. I'm not, as you will have seen, a natural carer, and this is not something I ever imagined myself having to do, but 12 years ago when she could no longer be alone you couldn't see the rest of her "loving" family for dust. I turned round and there I was, alone, and here I've been ever since - my mother's carer. Not once in those 12 years has a single relative offered to help, and not once has one of them asked if I'm Ok, or if my mother needs anything. I haven't had so much as an hour's help from anyone, nor a penny's contribution towards the cost. As far as I'm concerned, I now have no family. There are a collection of people out there who share my DNA, but they're most certainly not my family and I sincerely hope that I never see any of them again. If every one of them would be obliging and drop dead, I'd be delighted.
Then you will have nothing to reproach yourself for, Scout, knowing you are doing the best for your mum. Any child who can deny his/her mum, and ignore her needs, probably wouldn't feel that he/she ought to be behaving any differently.