Late november early december i had a pullet that seemed like she hurt her leg but it preceded to happen and eventually it got bad enough we had to cull her. Late december my sizzle pullet seemed to hurt her leg put then it healed and then it was injured again. Since then its been getting worse and now she cant stand but her feet can still grip and her legs can move but she cant stand or really control them either and now my mixed hen is loosing control of her legs and shell start stumbling and shell fall foward on her head and she usually just lays on her side. what is wrong?