Hi Patti,
I can only repeat what the others have said and that is that no one knows Tipper better than you. How much she can go through, etc.
I think that there are many unknowns. It is unknown if it is functional or not, it is unknown how long she will live with no surgery and it is unknown if she would survive the surgery and post op.
I don't think there are Any answers to those questions that are definite, so you have to make the decision of what to do or not do, based on what you already know of Tipper.
Whatever you decide, we are here for you, every step of the way.
Super big hugs
Sharlene and Molly Muffin