My mom got cancer when she was in her early 80's. She beat it and lived many more active years.
As for your "stuff", well, it's only stuff. Do what you need to do, and worry about the "stuff" when things are back to normal. I think you are right to do whatever you can to make her happy and comfy.
You and your family will be in my prayers every night. And if you are ever in western PA and need something, let me know.