Please forgive me if I sound insensitive. First of all, Breathe. Depending on the type she could be fine. If it is terminal you need to start making memories. Speaking from experience. My grandmother had stage four cancer, caused from a 24lb tumor in her uterus. She went through hell for quite a few years, lost her hair with chemo, and all that mess. But 15 years later she’s still kicking it! so far she’s only had one abnormal blood test. My father died stage four lung cancer and my biggest regret is not spending enough time with him. You cannot change what may or may not happen and you can only make the best of the situation that you are dealt.