The best advice I can offer (and I know not everyone is willing to do this) is to feed her fresh pressed green juice and home made bone broth. This will provide her with more nutrients and minerals than she would get with what little food you might convince her to eat. The body goes into starvation mode more over lack of nutrients than over calories. While calories are also important, it's easy to add calories with mct oil to the juices. You would need to get a good juicer to do this right. You would be surprised to see how fast this reduces pain, improves mood, and HEALS EVERYTHING.