also

regarding A)...

This will be an extremely hard trick to achieve...

But, as far as you can do it, make mom think like she is the one who is asking you to take care of her.

From what I read, she's not the person that would even ask anyone to take care of her...

But if you can make her picture whatever you are doing as a favour you're doing for her that you would otherwise not do (if she hadn't asked), then she is proportionately more likely to appreciate and thank the favour than to dislike, be jealous at and suspect the intromission in her daughter's life.