I came home early from work today and upon checking on my chickens I found one of them sprawled out in the coop unable to move her legs. I checked her vent for clogs, mites, or swelling and no issues there. She’s not injured anywhere and doesn’t seem to be in pain or distress, she drinks and eats when I put food and water in front of her. She can’t stand or walk and is barely able to use her feet. If I stand her upright, she either falls back or on her side. Anyone have an idea on what the issue could be? As I said, she was perfectly fine yesterday.