you got some good help - I just wanted to say how sorry I am that you're going thru this and really hope you find out what's happening so she can be treated and LIVE....poor baby ...that's so sad and we're seeing way to much of this lately.
My heart goes out to you. GOOD luck and I hope you can find a vet that will take the necessary steps to getting this little girl better....
having a puppy should be a happy time.