One of my hens is in distress. Yesterday she was fine, clucking and such, she is still young and has just started laying eggs. Today my husband found her, unable to hold her head up, or stand up on her own, He immediately removed her from the rest of the chickens and placed her in an empty baby pool. She won't drink or eat, doesn't keep her eyes open, does anyone know what could be wrong with her? She slept last night on the floor of the coop, instead of up on the branch, could that have anything to do with it?