I'm very new to keeping chickens, and I've got a black Sumatra that seems to be getting picked on by my 3 red Stars. They're not being super mean to her, but not super nice either. The poor Sumatra has been hanging out all day in the nesting boxes, and not coming out much to eat or free-range. Is it broodiness, shyness, or stress from being in a new coop? The birds all came from the same coop when we got them. Will she get more comfortable in time and come out by herself? We do not hatch eggs, so I don't want to encourage broodiness if that's what it is..