If the cancer is chemoresistant then I advise you to try radiation
since endometrial cancers can often br responsive to radiation. The diarrhoea
may be due to an infection because of lowered immunity as a result of the chemotherapy
. Giving Eldoper can worsen the condition, if the diarrhoea is due to infection. She might need an extensive course of antibiotics. You might have to get her admitted in a hospital and get a stool culture done to find the right antibiotics for her infection.
Hope she improves.