When I think of all Kevin went through I can't imagine your mom being able to do it. It is miserable and he was strong, healthy otherwise and overweight by about 50lbs. It took him down for 5 months and he lost 56lbs, and that was eating/drinking Ensure most of the time.
I'm not saying don't do anything, but she may want to just enjoy the time she has. Be sure she has a voice in it, as I'm sure you are. Sometimes I think patients do what they think their families want them to do even if it's not what they want.
I'm so sorry your family has been faced with this. We have all been there and truly understand the devastation.
Blessings,
Kathy