Jed, the best vets understand not only the animals they treat but their human caretakers' love for them as well. Vets keep them alive when it takes a level of skill above what most people possess. Ending their lives compassionately also requires skill. If you took Maggie in when she was sick, you fulfilled a responsibility to do what was right. If you take her in now, I believe it fulfills your responsibility in the best possible way for her.

Oh well, by now you've probably made up your mind. Whatever you do, I hope her passing is swift and painless and your memories of good times are strong. I'm sorry for your loss, Jed, but 'there are no roads that do not end'.