Becoming a
child actress at the age of eight, Haddock is perhaps best known for her role as
tomboy Cindy Webster on the first season of the
NBC television series
The Facts of Life. She is also known for her appearance on the
Wonder Woman television series as the superpowered girl Tina / Amadonna in the episode "
The Girl from Ilandia" and as
Robert Duvall's daughter in the movie
The Great Santini. She also appeared in the main cast of two
NBC series that were both cancelled mid-season of their first year: in 1977, she played Melinda Mulligan, the daughter of
Lawrence Pressman and
Elinor Donahue, on ''
Mulligan's Stew; in 1983 she appeared on Boone
, starring Tom Byrd. She also appeared in an episode of Little House on the Prairie'', as Amelia Bevins. In 2008, Haddock, along with
Molly Ringwald,
Felice Schachter, and
Julie Piekarski, was nominated for a
TV Land Award, in the category
Favorite Characters Who "Went Missing". ==Filmography==