Sorry to hear of all the troubles you're having to help with.
I have no information on the medical issue - but -
Try talking to the doctor's office to see what type of HOME HEALTH care she can get qualified for. How about Meals on Wheels for them. Local churches?
Is all their paperwork in order? Does someone have Power of Attorney for medical and financial? (Contact an Elder Attorney and get it in order. You don't have to use it until necessary). Is anyone's name on all their accounts (from banking to utilities to medical facilities)? There are lots of businesses that won't talk to you because 'you're not authorized'. :(
Best of luck to all in these difficult situations. Your family is not alone in trying to figure this out. There are millions dealing with similar issues.