So I think my chicken is a two month old English game bantam. She seems extremely healthy and alert and is eating and drinking and doing everything normal except she makes this sound when she gets too excited like she has mucus in her throat. I tried antibiotics but it did nothing so now I'm not sure if she's really sick. Any suggestions as to what she might have? I have two new chickens and km afraid to introduce them because I don't know if she is sick or not.