My first wife of twenty years died of cancer. She was diagnosed and had surgery, and then entered chemotherapy with a good chance of living five more years. But the first treatment made her very ill and the second sent her to the hospital for a month. She decided not to continue the chemotherapy, and lived two more years--for one of those years, she was in good enough health that we did some traveling.
Please try to support your friend in her decision. With hospice care, she should have some quality time left.