One of my female Pekins I noticed today just sitting in the middle of the yard all day. She didn't move at all. Just sat there kind of puffed like she was sitting on an egg. I went to check on her and gave her some water which she did drink. She would not eat anything. I moved her into a crate to keep her safe and separate from the others and she didn't try to move or get away from me when I moved her. Any idea of what might be wrong? She's about a year old. I have 4 other Pekins and they are all acting normal.