I won't ask what she has, but I'll just relay this story to you:
When I was about 5 my parents had a friend who was diagnosed with breast cancer and given 6 months to live. To show support for her, my parents put our family on the Macrobiotic Diet since she didn't think she could do it alone. That was 15 years ago, and she's still alive today. Check out the
kushi institute site for more information.
As far as being with her, would you rather be with her and be sad, or not be with her and have regrets and still be sad? Go for it