She is an 9 yo Buff Orpington and has been sneezing for about 1 and 1/2 months.She started about the time my rooster died and I introduced some new pullets.I have considered that it might have been a disease that she got from these other chickens but my rooster seemed to have had a stroke and all my other hens are fine.She shakes her head when she sneezes and her comb is oddly colored.Please help!!