You hang in there best you can. There is alot of support out there and you can NEVER give up hope! When we found out about my Mom we felt like the ONLY people in the world...and we ran into alot of dr's that amazingly didn't offer much hope. It is a very scary outcome- if we let ourselves listen only to the statistics and all- but there are SO many survivors out there and who's to say which percentile you will be in. The best thing will be to remain positive for your Mom and when she is ready- do everything to make her not feel alone- I have found a deeper faith thru all of this and, while the outcome might be weeks, months, or years- believe that there is hope and hang onto that to the end!
I will add you and your Mom to my prayers-
Maria