Ann I was thinking about the doggie diapers too.
Might want to talk to your vet too, and see
if they can offer any suggestions.
We had a senior large dog, that when she
could no longer controll her poop or bladder.
We made an area for her in the house that
was blocked off, where she could sleep.
During the day if we were not home
we kept her in the back yard.
(I live in Calif. where the days are never
to cold)

I agree if her quality of life is still good and she
is not suffering than I would wait.

What ever you decide is best fo your girl we
will all support you.