Hello and welcome to Psych Central! I would be worried, too. And would want to get her to the doctor as soon as possible.

She could have some sort of physical problem, I think, such as a stroke or a tumor, or as I guess you suspect, some sort of mental problem. I am sorry she is sick and hope that doctors can figure out what her problem is soon.

I also hope she won't put up too much of a battle about going to the doctor.....I'm not sure you should confront her with her bizarre actions, but let's see what other folks have to say.