I am so sorry that your mother and all of your family is going through this. You didn't mention if your mom was having chemo or not. Historically, there isn't anything that really treats the cancer. My dad has GB cancer and is on Gemzar chemo - and his cancer is responding to it. He also has to have his belly tapped about every two weeks and they ususally take 4 liters off each time (total of 14 liters in 6 weeks). Dad doesn't have too much pain - it is usually relieved by percocet every 6 to 8 hours. The only comfort I can offer is to make wonderful memories together as much as possible and if you or she believe in God, prayers for comfort and joy. You and your mom will be in my prayers for comfort, healing and joy.
Charlotte