We have 6 chickens that we got at a day old on May 1st. They are all laying except for one now. And the one that is not laying I think is half blind. She is getting food and water and will follow the other chickens around but will peck randomly until she finds the food. I call her Nellie and she refuses to sleep up on the roost. She has taken over one of the nesting boxes. I have repeatedly put her up on the roost but she will not do it on her own. And sometimes the morning after I've put her up there she's still up there when all the other girls are out in the pen eating. I look in and she looks all nervous like she can't get down She has a thick cloudy spot on one eye so that is why I am thinking she may be part blind. Any suggestions? How worried should I be? This is Nellie in their temporary pen. This is one of her very curios sisters Rosie who would not let me take a picture of any of the other chickens!