We have three hens eight months old. They were raised together from two day old chicks. They are Orpington, Barrd Rock and New Hampshire Red. We have built them a large coop and let them out each morning to free range the backyard. Recently, the Orpington is being bullied by the other two and now she stays in her nest a lot. When out of the coop, her behavior is strange: she will make a big squawk and dash across the yard for no apparent reason. Is there anything we should be doing to help the situation?