Not much to add to the other advice except that if she can have full medical attention and at least some food into her some of the anxiety and other issues might reduce. I have seen that happen with my ex-gradma in law. Refused everything, couldn’t manage meds, told her daughter the most awful things when she was moved to a home, but she thrived there. Might not help, but it’s pretty awful now plus you are trying to just keep her alive. Get the professionals in so you can be there in other ways.