Remember I told you about my cat having the exact same situation? I would like to support you, and I truly hope that some of these things might help, but I want to say that sometimes, if a cat is in the condition that your cat is in, there might not be a lot of time. If she starts to hide, that is an indication that the time is near. My cat went down hill pretty fast, and unfortunately, we were emotionally unable to do the right thing. She ended up in a coma.
If you can get some CS and it works, then you need to let everyone know!
I hope it works out for you, but please don't let her suffer.