First, cassiel, I'm so sorry to hear about your mother's diagnosis. :-(
My advice to you - treasure every moment you have with her from now on. My personal experience with pancreatic cancer has not been good, but I can't speak for all cases of course. I lost one friend after a 6 month fight, another after a year. But as sad as it was to lose the people I loved, both of them had the same attitude - "I've lived a good life, I've done good things, and I'm proud of what I'm leaving behind." I think that attitude helped them as much as it helped the rest of us struggling with it.....
Cancer is a terrible thing. Its touch is wide. Let your love for your mother be a strength to her, and hers for you be a strength to you. I will pray for you both.