Today I didn't see one of my polish chickens outside I went in to check on her and change water and feed, she was behind the water bucket and I thought she was just drinking. When I changed the water I noticed she didn't look right just sat there. I picked her up and she didn't run not like her. Her skin around her eyes are yellow. Does that mean anything the others are white. I put her by herself with some food and water after noticing one other peck at her and she didn't run. They peck at each other all the time but usually run. This one doesnt'look right not sure but looks a little sluggish and the yellowing not sure what that is do you have any suggestions. when I left the coop she was eating I gave her cracked corn this is new this past week that wouldn't do it would it. And I gave her chicken feed and fresh water.