I know it's been asked before, but I wasn't paying attention. I adopted a hen this summer, but she won't roost with my other three hens. She sits in the nest box instead, and I wouldn't mind except for all the poop. How can I discourage this? Do I need to provide her with her *own* roost? I know she roosted at her old house, so this is clearly just her and the other chickens not wanting to be too close to each other.