Does her face have a bad odor? Respiratory disease with sinus infection can be a sign of mycoplasma gallisepticum (MG) or coryza which has a bad odor. There is no cure, but your flock will become carriers for life of either chronic disease. Some cull for a disease like this. Tylan 50 injectable given ORALLY is the easiest antibiotic medication to find in find stores that might treat symptoms, but will not cure it. Sulfa antibiotic (sulfadimethoxine) which comes from a vet may be needed to treat coryza. Here is some reading about both diseases: http://extension.umd.edu/sites/exte... Mycoplasma gallisepticum (MG) Infecti....pdf