She wants ever so much to simply go back home.
Then do it.
There is nothing, at this point, that a doctor can do to change the outcome.
You can hire a nurse to come check on her a few times a day just to make sure meds are up to date , or oxygen tank is in place...etc..etc.
call hospice. They do that for free.
if it is possible, and something you are comfortable with, know right now that it is NOT illegal, it is NOT a requirement to keep her in the hospital and that there is NOTHING that can not be brought home to her.
It can be done. Just expect friction from the doctors. Expect it and put on a hard hat because ICU are hard core. ! But, in death, there is nothing they can fix. An there is no reason one person can not die at home.