One of my leghorns came up sick. She was hunched down, her tail was drooping to the ground and she wouldn't stand to scratch. She also allowed me to pick her up, which was out of character for her. After some research, I got some tetracyclene from the feed store and gave her 1cc, twice a day (mixed according to package directions) for 7 days. I also dusted her down with DE. She improved somewhat, carrying her tail higher but she is still hunched down. She looks swollen. Any ideas?