When they are that hard headed, really what else can you do? You are a great dog mama.
My fear with all of my dogs was that I would wait too long and then realize how they were suffering. I think I waited too long with Nod. I can't believe it has been four years since we had to let him go. I held on to him for me. And definitely with Sunny who had Melanoma.
Hoping Gracie will let you know when it is time.
(((((hugs))))) and a prayer for today at the vet for both of them.
Please do not beat yourself up. Sometimes we have to hurt, so they can stop hurting. That is the part that truly sucks.
Sending love. I hope you can have more time with her.