I have 5 orange hens. They are one year old. Lately the one hen has not been coming outside unless it is daylight. Her feathers are tattered looking and she is keeping her wings raised. The other chickens are pushing her away when she is eating. But she is getting to eat scratch and pellets.she is acting normal, but the others are sort of bullying her and she looks tattered. Can anyone suggest what may be wrong with her? Her tail feathers are the only ones that look bad.