One of my Barred Rock hens can't walk. She was in the coop yard this morning, upright but won't walk. I picked her up and put her in a separate pen for today so the other chickens wouldn't pick on her. I just cleaned out her little pen and she is still not walking. She is bright-eyed, alert, eats and drinks. Her poop is fine, not runny. I have checked her feet and they don't seem broken, but she just won't walk. When I tried to hold her up under her chest to give her some support, she started squawking like I was hurting her. All my other chickens seem fine - ugly right now going through a molt, but fine. What can I do for this poor girl?