Yes, she was just in a nest box in the main coop. The last 2 eggs were dud but she was still sitting on them at the time. The other chicken went into the coop and got one of the chicks and ran out. Mother was then chasing her around trying to get it back. Very distressing. I never expected it from that chicken either as she is bottom of the pecking order and quite friendly. My lesson, was to seperate earlier on.