My sister suffers from advanced ovarian cancer. She was diagnostized with the disease about 4 months ago. They offered her surgery followed by chemotherapy treatment in order to extent her life a little longer. She refused this because she does not want to go through all the side effects such treatment will cause.

Can you tell me if at this stage of the disease there is another alternate treatment(holistic, for instance) that can help her to prolong her life for a longer period?

I will be grateful for your information/recommendation.