This has been coming for awhile. She is in her late teens and has a lot of things wrong with her. We have been avoiding doing this for months, as she has still had a good quality of life, she has just needed more care. In the last 24 hours her body has started to fail, so we are taking her to the vet in a little while. I feel so bad right now. This is really terrible. I have been trying to act cheerful, like nothing is wrong, to make it better for her.