Whipple Procedure/Duodenal cancer

Any suggestions for someone who can only tolerate a teaspoon or so of food after having a Whipple procedure?  My mom--74 yrs old--is practically fading away as we wring our hands and try to get her to eat a little and take a few steps.  I'd really appreciate any suggestions--the metallic taste in her mouth and the nausea are a double whammy.Thanks so much!Marcy...