I have a 3 week old chick that was sneezing last night - after some BackYard Chickens research I hoped it was feather/bedding dust bothering her. This morning she is sneezing constantly and her left eye is runny. I have no idea where to even start! Some details: -breed - French Black Copper Marans -She started out a runt. less than an ounce at birth but is now up to 5 oz. She is still half the size of the other chicks. Healthy in every aspect but size. -She has been on medicated feed and fresh water only. -there is no blood in poop. It looks normal. -no lethargy. In fact she hasn't stopped screaming since I isolated her!