We got her through pneumonia! Pepper is MUCH better. The awful coughing and gagging have stopped, although she still sleeps much of the time. Her strength is coming back gradually, but she was up to playing with me yesterday in the back yard. We still have a few more days worth of pills to give her, and I have to check back with the vet, but it looks like our girl has recovered! YAY!
Thanks for everyone's thoughts and prayers.