Something is wrong with one of our Narri hens. All that is obvious to us is that she doesn't open her eyes quite as wide as she should (there is no discharge from eyes or nose), and as of today, she doesn't move right. Her legs seem weak, she walks around with them bent, low to the ground, and she can't get up on the roost with the others. We've taken her out of the turkey pen, and isolated her in a crate in the barn with food and water. Any ideas what could be going on?