We have six chickens that are four difference variations. The smallest of the bunch is a bantum and is about half the size of the others but the same age. The other chickens are picking on the bantum and pecking and attacking her. She doesnt seem to be hurt but she now will not leave her nesting box. I took her out of the coop tonight and put her alone in a dog crate so she could eat and rest but I do not know what to do about the situation. Any advice?