My one year old silver spangled hamburg hen has been unwilling to leave the nest box since yesterday afternoon. She has a sort of glazed look in her eyes. When I lift her out of the nest box, she pecks at food on the ground. We thought having her walk around outside might help. She went outside, got a drink of water from a bucket, but didn't hang out with the 3 other hens. She went into the mulch by the deck, sort of took a dust bath, stretched out on her side, then sat again as though she were on the nest box, fluffed up the feathers on her back. Then she would get up, stand tall, make a loud noise aguh! unhhh! and shake her wings and feathers. She did that a few times, sometimes running a bit. Any ideas? Is she egg bound? I'm a newbie!! thanks!