Sundwall was born on October 23, 2001, in New York City.[citation needed] In 2012, she made her first appearance in television on the documentary series Celebrity Ghost Stories.[7] She appeared in Law & Order: Special Victims Unit in 2014.[8] In 2015, she acted in the romantic comedy-drama Maggie's Plan,[3] the thriller Freeheld,[9] and the horror film #Horror.[5] She plays the role of Penny Robinson in both seasons of the Netflix series Lost in Space, which first aired in April 2018.[10]