She may want to mentally scan her body for pockets of tension or pain while breathing deeply. Good nutrition and staying hydrated will keep her body going. Advise her to drink 64 ounces of water a day. If she doesn't like the taste of tap water, suggest distilled, purified water. Find ways to be touched.
Hugs are therapeutic for most people.
She may want to consider making time for an occasional massage or other touch-therapy treatment. Nourish the spirit. A caregiver may find that reading the serenity prayer helps her focus on herself and her own well-being during a loved one's dying time. Whatever method she chooses to nourish her spirit, advise her to do it often. Caring for a loved one who's dying shakes us to our core and forces us to confront feelings and beliefs we've taken for granted.