hey allabout where did you get this hen? I hope she'll be okay, I found this site on Corzya, you can read this and see if it pertains to your new girl then post back please.
http://www.google.com/images?client=gmail&rls=gm&q=Infectious+Coryza&um=1&ie=UTF-8&source=univ&ei=HotNTe_bOoycgQehyojWD