I have a RIR who has been coughing/sneezing. She doesn't have any issues with dried mucus or cloudy eyes. SHe acts normal except for the coughing. She is about to start laying soon and the weather has gone from warm, to cool to warm. She makes a loud, agiated sounding "crow." I did notice today that her comb had some color chnge . Red to some parts purple. Any advise would be greatly appreciated.