Hi, dear I have gone through your question. I can understand your concern. She had bowel cancer and she has gone through surgery twice. Now she has metastatic cancers in lung, liver and bone. It is stage 4 cancer. Surgery is not possible at this stage. Only treatment options are chemotherapy and radiotherapy according to type of cancer. But it can not cure the disease. Her back pain may be due to metastatic cancer. Morphine based pain killer is useful in terminal stage cancer pain. Despite of all treatment prognosis is poor. Life expectancy is not good. Sorry to say but it is the fact. Consult your doctor and plan accordingly. Hope I have answered your question, if you have any doubts then contact me at bit.ly/Drsanghvihardik, I will be happy to answer you. Thanks for using health care magic. Wish you a very good health.