I brought Nicky in to see the vet today. He examined her. The lungs are clear. No sign of gapeworm (which he says is more common in commercial flocks than backyard flocks). He thinks she has a bacterial infection and is treating her with vetisulid powder in the water for 10 days. We'll see how it goes. She was a trooper going to the vet. Sat in my lap the whole way and only pooped on me once.