I just went to let out my hens for the morning. One of them was sitting there with her head flopped waaaaay back, face pointed up. I went to pick her up and she is just flopping around with no balance. I don't know if she can use her legs even. I moved her away from the other chickens, but I am unsure how to proceed. She is a Barred Rock, hatched the end of March. My other hens are all laying, but she isn't. Her comb is smaller, and she is not very bright. I actually saw her run full speed into the fence the other day because she couldn't figure out how to get back into the run. I don't think she is blind, she does pick around and look for food, she isn't small (just her comb and wattle). Any advice would be appreciated, even if I need to cull her. I don't want her to be miserable.