I know this is a relatively minor issue but I have an 8-9 month old GLW hen who is healthy, laying regularly, accepted by the other three hens in our crew, but who insists on trying to sleep in the nest boxes at night while making a poopy mess in there. I started going out every night for about two weeks and moving her to the roosting bar after they had all gone in, I have since blocked off access to the nest boxes at night making sure she is on the roost bars with the others for two more weeks and then removing the blockade in the morning, and as soon as I removed the blockade the other night and tried to allow her to fall in with the others, I wake up to find a night worth of poo in the preferred nest box for all hens, I just don't know what to do. I have a six foot long roost bar from one side of the coop to the other that is more than enough room for all four hens, I have added an additional bar mounted on the back wall in case any of them want their own space, both roost bars are located at least 12-18" above the nest boxes and yet she still after a month immediately goes back to the nest boxes the first chance she gets at night. I have watched all of them go in at days end, there is no pecking, no fighting for preferred position, plenty of space and everyone seems happy. She just absolutely refuses to sleep on a roosting bar if she has another option (such as the nest boxes) available to her. Can anyone offer a reason and/or solution to this issue? She is not bullied by the other hens at any point within the coop/run or while out ranging in the yard. Any help would be greatly appreciated!