Xeloda's biggest issue is HFS (hand foot syndrome), which causes redness, swelling, and pain on the palms of the hands and/or the soles of the feet. She'll need to reduce friction and heat exposure to her hands and feet so have her avoid washing dishes, gripping things like knives or garden tools. etc. It even hurt my hands to open a screw-top bottle!
I used Aquaphor and then put on cotton gloves afterwards and that helped a lot. I also applied it to my feet before bedtime and wore loose socks to sleep. Cold compresses helped when my hands and feet felt hot. I remember sleeping with cold compresses against the bottom of my feet. Also, look for nice comfy shoes with a wide toebox and insulated insoles because your feet can get very sore.
Taking Vitamin B6 (pyridoxine) may be beneficial to some patients in lessening the effects of HFS. I took 100 mg with each dose of Xeloda. Ask her oncologist before taking it though.
Also, watch the timing of Xeloda. It needs to be taken within 30 minutes after eating a meal, but it seems to vary for each person on the right time. I had a lot of nausea if I took mine too soon after eating. My "sweet spot" was exactly 20 minutes after finishing a meal. And make sure she takes it with a FULL glass of water, not just a sip.
I second the recommendation on ginger!
I also found that Goldfish crackers were a bit help with nausea. Nibbling on them calmed down my stomach.
Hope this helps!