All my chickens are the same age and one is pecking the other one when it comes over to scratch with it and when I hold her.I notice it after she got back from a show but she's been back for 4 days now what is wrong?
It sounds like typical Pecking Order (Flock Hierarchy) activity. As long as they are not fighting enough to draw significant blood, I wouldn't worry with it. They will sort it out in time.