chicken on the roof

So for the last two days, we've been having the chickens put themselves to sleep in their coop instead of ushering them in earlier. This seemed to be working okay until today. I saw them all go in and made a note to go out there and close the door later. Then the chicks all came out again and started clucking. Suddenly I heard a big squawk so I looked outside and realized Buffy had jumped on top of the big door. I didn't realize she could jump that high. C went out there to get her down and she then stepped up to the roof of the coop. I was a bit nervous that she would then go up to the roof of the house. To make matters worse, the other chicks started squawking - maybe they were telling Buffy to come down? Anyhow, C was eventually able to get her down from the roof. Still not sure what caused her to jump up there.