Her sister was Ann-Marie Peterson.
Her brother was Rev. Jim Peterson (aka James H. Peterson, Jr.).
She was an active member of the Greeley Saddle Club (horses).
Daughter of Dr. James Peterson, an otolaryngologist (an ear, nose and throat specialist), and Sylvia Peterson.
She drove a white BMW in high school with the license plate PEAC2U (Peace to You).
Out of the massive cattle call for the title role in Annie (1982), she was one of the final 10 girls being considered. She lost out to Aileen Quinn, but still got to be one of the orphans.
Acted in about 50 TV commercials by age 14.
She attended University High School in Greeley, Colorado; Middlebury College in Middlebury, Vermont; University of Northern Colorado in Greeley, Colorado; and Colorado State University in Fort Collins, Colorado.
When Amanda Peterson was 15 years old she suffered a traumatizing rape by a 27 year old man, which her family chose not to disclose until after her death.
Her death was due to accidental morphine overdose.
Had two children including daughter Stella Rose (b. 2007).