MY Sussex hen 21 weeks old is limping and hoping all around my coop has roost and a rooste shelf but the jump is only 2 1/2 feet at most any where .. her feet look fine.. no scabs and if they are swollen they are the same size...she was in the coop hooping and hollering , but she is in general loud I thought she might be gonna lay .. and when she walked it was a hop... Please Help..