Nursery-rhyme girl with lost sheep (2-4)
I believe the answer is:
bo-peep
(Other definitions for bo-peep that I've seen before include "Nursery rhyme 'Little ...... she lost her sheep'" , "One suffering ovine misplacement" , "Loser of sheep" , "Little girl whose flock went AWOL" , "The little one lost her sheep" .)