I have this hen that is about two years old and is a barred rock. All the sudden she started acting different looking like she can’t see an object as close near to her and just a couple of days ago she started to sleep outside standing up in the middle of the day when all my other chickens are somewhere else. She does eat from what I can tell she hasn’t lost a huge amount of weight but her comb in her face have became a lighter red color compared to all my others and become freezing to the touch (I don’t know if this is bad). She does drink some water and food when I was around with them last. She does move around but not as much as she used to and sometimes if she moves too quick she loses her balance or her leg will slip from underneath her. On the sleeping part I had a hen just three months ago start doing that behavior is perished from that. I’m trying to figure out a treatment or a possibility of what this could be. So I have an understanding of how to move forward. Any ideas on what it could be? I have attached photos of her as of today.