If you wish to try some more nursing care with her then I would suggest checking out the mobility tools at www.handicappedpets.com which range from wheels to a harness to help your dog stay steady on stairs etc.
You might find a diaper with a tail hole in it helps with the incontinence clean up issue though you will have to keep the dog clean.
My personal criteria on a dog is that when it can no longer do the things it enjoys, when it is in pain that I can't control for the dog, when its not having any quality of life that is when I put aside my own feelings and let the dog be euthanized.
Its individual dog to dog and owner to owner when this point is reached. If you think some care tools will help you both have some good time together then maybe that is the way to go.
Hope this helps you!
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