My 18 week pullet won't get out of this position. I noticed yesterday she seemed a bit off (standing still by herself), but today she can hardly move and just stands like this. I brought her in and fed her some yogurt and scrambled and cooked lentils, and she ate quite a bit. Any idea what this could be? She doesn't have diarhea and keeps trying to perch on the lip of the box, so she is seemingly not feeling too terrible.