one of my new barred rock hens, when I LET THEM out in day to free range, at night all come back but one of them. In the morning, I find her outside the coop looking in. She goes in when I open the door and is fine,. I have even checked around when I LOCK the coopm up for the night, and do not see her. She must be sleeping somewhere else, is thius common, has anyone had this before. She is fine, you think she would want to be with her sister and her other hen friends