I have ten hens 11/2 old free range all day. 1 hen just started to stay in laying boxes all the time about a week ago. She's not to fussey about wich box she is in. If I take her out she will peck around for awile then make her way back to the laying boxes. If I lock the door to the koop she Is fine with it just goes about her bisness. She has always been sociable with the other chickens. The first time I took her out the other day the other hens jump on her. She fought back now if one jets close to her she will attack them first. Also she eats,drinks,poops,ect just fine. have any one seen this behavior before?