Rinehart attended Lindbergh High School in St. Louis, Missouri,[5] and earned a Bachelor of Arts degree from Barnard College, where she majored in sociology and minored in German.
[6] When she was 10 years old, Rinehart starred as Marta, the second youngest Von Trapp, in a professional production of the Sound of Music in St. Louis.
[8] Rinehart also reunited with the other Von Trapp children in December 2014 at 54 Below for a concert to promote the re-airing of The Sound of Music Live!.
[9] She has had several other film and television roles, and starred in the Justin Timberlake music video for the song "Mirrors".
[11] In 2016, Rinehart appeared in episodes of Quantico and Blue Bloods, and 2017 in Law & Order: Special Victims Unit and What Would You Do?.