We sadly made the appointment, went to the ER vet...and the vet came out and said "She's eating."
We said "...what?"
She's eating. She's walking. She has gained weight since admittance. Her lab numbers are the numbers of a cat who died some time ago, but her kidneys are doing SOMETHING.
"Treat the patient in front of you," said the ER vet. "She's not dying. Somehow. If she were mine, I'd take her home."
She may get a week or a year, but she is not acting like a dying cat.
If she wants to live that bad, she gets another try.