So happy to hear that you are seeking other places for some answers/treatment.
Yes, this is a horrible disease....and your Grandmothers age i am sure does not help any. But it is good that she was healthy prior to the surgery.
Get as many opinions as you need. There will be a team of doctors that will care, even if the prognosis isn't the best.
My Father was 74 when he had 40% of his stomach removed and his Dr's took excellent care of him. They were very informative. We did go to 2 other places to seek 2nd & 3rd opinions. But it was too far gone by the time it was caught in the 1st place.
Blessings to you and your family. Keep up the fight. Get info off the internet and anywhere else you can. Ask lots of questions and never take "no" for an answer. Every patient is viable until their last breath. Find a facility that is willing to give you all the answers and help you need and your Grandmother deserves.
Peace, Kris