Thank you for your reply
She's in a nursing home right now, nearly a state away, but we try. The staff is trying to get her to drink Ensure, but more than a few sips causes her to vomit. The doctors can't figure out why that happens, either

Maybe has something to do with the "no appetite"/no stomach thing.
I'm sure if they did a nutritional check-up on her they would find that she is pretty deficient, as, to my understanding, she eats about three spoonfulls of stuff a day and then sleeps it off the rest of the day. I don't know how she survives like that! It is scary!
I will tell her caregivers about the appetite stimulant, for certain.