​From Wikipedia, the free encyclopedia Leigh-Allyn Baker (born April 3, 1972) is an American actress. She is best known for her roles as Amy Duncan on the Disney Channel original series, Good Luck Charlie and as Abby on Nickelodeon's animated series Back at the Barnyard. Description above from the Wikipedia article Leigh-Allyn Baker, licensed under CC-BY-SA, full list of contributors on Wikipedia.