BarbSending good thoughts and prayers to you and Tiny. She sounds like she's doing really well for her age with the exception of eating.
I had to let my bridge boy go at 15.5, it got to be a struggle to get him to eat. I ended up cooking a lot for him and gave him basically whatever he would eat. He too was on Tramadol.
I know when they get to be this age, you start worrying about every little thing. This time is so precious and you want to do everything you possibly can for them.