I have this problem with my 84-year-old Dad on and off. Will she drink a nutritional shake? My dad will drink Boost Plus, which has 360 calories in a shake.
ETA: He also takes CBD, but only at night for sleep, and after terrible insomnia that made him delirious from sleep deprivation, a few days after he started CBD, he started sleeping through the night.
I can’t credit placebo effect, as he was delirious and didn’t know what he was taking when we started it. But it worked, and when we stopped it for a few days, his sleep was again problematic. So whatever it is, it’s working for him.