I have one chicken who lays her egg each morning under the roost in the run, where my 5 chickens have been pooping all night. Now that it's dipped below freezing at night, they get tucked away into the coop without access to the outside run. I was hoping this new location would prompt her to try the nest box but she still chooses to lay her egg in the middle of the new poop pile inside. Ewe. My other 3 active layers all use nest box but for whatever reason this one chooses poop. Help. How do I fix this?!