Crystal McKellar

Crystal McKellar was born in San Diego, California, but when she was seven years old, her family moved to Los Angeles. She and her sister Danica were both students at the Diane Hill Hardin Young Actors Space school. The sisters sometimes competed against each other for roles, including the role of Winnie Cooper on The Wonder Years. Although the directors had strongly considered giving the part to Crystal, Danica was cast instead; Crystal would go on to play Becky Slater, a recurring character and onetime love interest of Kevin Arnold. She was nominated for the Best Young Actress Guest Starring In A Television Series award at the eleventh annual Youth in Film Award in 1988 and 1989.

source: wikipedia.org