At age seven, Peterson made her stage debut as Gretl von Trapp in a
University of Northern Colorado production of
The Sound of Music. while also appearing in more than 50 television commercials. which was canceled after one season. In 1985, Peterson won her first major film role, playing Lori Swenson in the sci-fi fantasy
Explorers. Despite performing averagely at the box office, the
Joe Dante-directed feature went on to secure a
cult following. Next, she co-starred as Sunny Sisk, the granddaughter of a successful businessman, in the
Emmy Award-winning miniseries
A Year in the Life; the third highest-rated miniseries of the
1986–87 U.S. television season. It was later adapted into a full series, airing on NBC from 1987 to 1988. For her work as Sisk on the show, Peterson won a
Young Artist Award. In 1986, 15-year-old Peterson was cast to play the headline role of Cindy Mancini in the
Buena Vista romantic comedy,
Boy Rents Girl. The title was later changed to ''
Can't Buy Me Love'' after producers secured the rights to
The Beatles' 1964
song of the same title, which featured on the soundtrack. with Peterson going on to achieve
teen idol status as a result. In their critique of the film,
The New York Times found Peterson's portrayal of Mancini to be "appealing", while highlighting her chemistry with co-star
Patrick Dempsey. In 1988, Peterson starred in a
Roger Corman production, the post-apocalyptic adventure film
The Lawless Land. This was followed by a co-starring role in the 1989 ensemble drama
Listen to Me. She returned to her hometown of
Greeley that same year to graduate from
University High School, having been privately tutored while working in Los Angeles. Shortly afterward, she starred in the
straight-to-video thriller
Fatal Charm (1990), playing a naïve high schooler who forms a dangerous bond with a serial killer. That fall, Peterson enrolled at
Middlebury College, Following a recurring spot on the
ABC drama series ''
Jack's Place'' in 1993, Peterson's final appearance on-screen was a supporting role in the 1994 fantasy film,
WindRunner, filmed when she was 22-years-old. ==Later years==