I'm glad missy is still relishing her meals and enjoying life and her new house!
She sounds like a real trooper!
As for your question about how long, Priscilla hung in there for about a year...
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."