[Lala]

Ron,
The Xeloda can cause side effects if the dose is too high. Perhaps the oncologist can lower her dose.
Fatigue is a side effect of all chemotherapy. The diarrhea is more of a concern, you need to watch out for dehydration.
There are several ways to combat the diarrhea, one is diet and the other is medication such as Lomotil which needs a prescription. Many take imodium, however lomotil is a little stronger. If diarrhea is more than a few times a day you should call the oncologist.
Best of luck to your Mother.