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Lizzy it could be any number of things but if she is breathing hard she certainly could have caught a cold. Are you letting her out to get sunshine during the day. Vitamin D and E, and B are essential to their health,and free ranging is the best way to get those
After losing several of her chicks to what I believe was the puppy, I have kept the mama hen and her remaining chick locked up in the North side of the coop. Since it has been nice the last few days, i have kept them in a large dog cage outside, making sure they have the opportunity for sunshine if they want it. My Dh is home today, so I've had him watch the dog while the mama and her baby free range. Mama seems to still be injured and isn't walking around much, but at least she isn't breathing hard like she was the previous day. I have stopped the Tylan and will just watch her. She seems to be doing better after a few days of the Tylan so we'll see how she does from here on out. She is definitely limping still so I'm assuming she's managed to hurt her leg somehow.