My four month old Easter Egger pullet has been sitting still, lethargic and unresponsive since this morning. I've checked her all over for any sort of injuries but didn't find any. I haven't seen her stool(I don't have her quarantined)so I can't tell you what her that looks like. Her eyes are bright and alert and she drinks water when I dip her beak in the water dish. Along with the lethargy, her breathing seems to be a bit louder than normal and her feathers look a little ruffled. I don't think it's the heat as it's only 73 degrees. Any ideas on what could be wrong with her? Thank you in advance!