hi, my flock have had pox. a 6 mo pullet has some respiratory issue (rattling breathing) and hardly walks. she lost weight, her legs have an x shape but she eats and drinks normally. she does sleep on the roost and pecks the others as if she was ok. I give her baytril, her breathing seems better but her walking is the same. what is the reason for weakness in her legs? and why did they change the shape?