Ahhhh, poor, poor baby! If she had only come sooner to you, John, she might have made it. So many years of a bad diet takes its toll on a body and, when it reaches a certain point, liver damage is simply no longer reversible. I have seen the same thing happen to a couple of birds... they rally with a good diet but, after a while, the body can no longer take it and gives up.
Let me know what you decide on my proposition to you.