I have introduced new birds to my flock before without any major problems. I have my grow out pen inside my coop. I had my May chicks in it for almost a month. Two or three days ago I let then out. Today husband noticed that one was kind of listless. So he put her back in the pen. The established birds seem to not be letting the young one drink. She it's not looming.go good what else can I do for her?