Hi, I Have A Sister With Stage 3 Ovarian Cancer,

Hi, I have a sister with stage 3 Ovarian Cancer, she had the ovaries, uterus, and lymphs removed. She has been on treatment for 6 months with chemotherapy and a medicine named Avastin. How many months does she need to continue under chemotherapy? Her tumoral factor now is 4.9. One of her doctors said that she need to continue just with the Avastin medicine for one year and another one said stop everything regarding chemotherapy. Can you advise us what is the best thing to do?