I am so sorry to hear about your mom.
I work in a pharmacy and as far as I know it is important that your mother doesn't lose weight. If she hasn't much appetite she can drink high-caloric solutions.
I don't know if there is something similar in America but I'll include links to two of the companies that produce those in Germany.
Nutricia Fresenius Kabi I hope this helps.
I keep you in my thoughts.
