Found my young hen laying on her side in the dirt today. She is unable to control one leg whatsoever, but does have control over the the other one. She can't walk and can only lay on her side. Vent was covered in yellowy green poop. She is now panting, but still seems to have an appetite. Is it possibly a riboflavin deficiency? I've been feeding her yogurt because of the suspicion. Any advice or help would very very welcome.