I have four bantam per hens. Two are sisters -buff hens, one is a white Japanese and the other is a Dutch fluffy cheek. They're just over a year old and up till now have been no problem. One of the buff hens went broody for over six weeks. I kept taking her out of the nest box but she'd sneak back in again. Then she just got over it but the Dutch fluffy cheek pecks her away from the food and just seems to bully her so she goes back in the nest box for most of the day. Her sister sits in there with her so I leave the lid off the nest box so they get sunlight and breeze, but how do I stop this bullying? They are kept in an aviary 12' long x 6' side and 6' high do they have plenty of room. They have a spacious coop.