I've got two 8 week Ameraucana chicks who I've been letting out in the backyard when the weather is nice. One is fine and walks all over and even flies little short distances. The other sits like a bump on a log. She won't move. I've picked her up and moved her, stood behind her to see if I can prompt her to move, all to no avail. In the brooder she will run away from me sometimes and she can balance and roost so I don't think it's a leg issue. Any ideas?