Iam desperate to help her. Have 4 layers, bought 4 pullets. One pullet is breathing raspy, heavily so i can hear her from 5+ feet away, like a gurgle. Coughs and sticks her neck out, gasping. Eyes, nose clear. She eats and drinks. Free range with other chickens. Has been like this for 4 days. I put Durmycin in water for all chickens so wont be eating eggs for a while. Other pullets act fine, as well as layers. Any suggestions? Have had her for a week, went away for 4 days, came back and she was breathing funny. Help!!!