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I guess I am concerned that the cause of the esophageal problem has not been diagnosed. Regardless, the prognosis is usually not real good. Myasthenia Gravis is one disease that can do this as well as causing other muscle fatigue.
The benefit of placing a stomach tube is that you leave her face and mouth and esophagus alone. The tube is used to keep her alive while you figure out the problem. Dogs handle this real well, but you need to decide if you are willing to find the diagnosis.
You may be at a point that you ask your vet for a referral to a board certified internal medicine specialist...to take the next steps. I agree that force feeding is not the way to go and it is suffering.
So...that choice is up to you. In the area you live, there should be several internal med vets...you might just get her referred ( you take your xrays and bloodwork and records) and they review options and idea. If they can't give her a hopeful prognosis...then you have at least tried.
I hope this helps.
I am so sorry for your loss...I know this has been so hard for you. She is in a better place with no illness and no veterinarians poking her.
My prayers are with you.