So sorry, but will keep her and you in my prayers.
Depends on a lot of things including type of tumor, but I'm thinking that if they said 1-2 years that is a pretty optimistic projection and maybe there is good treatment for what she has.
A prominent attorney here woke up one day unable to hear in one ear. Very sudden. Turned out he had a brain tumor in a bad place, very scary, but he had surgery, I think gamma knife, and turned out fine. I don't recall if he had chemo or radiation, and this was about 15 years ago.