Seiger is from Cary, North Carolina. Seiger's mother is an opera singer and voice coach, and their father is a jeweler and goldsmith.
Seiger attended Apex High School. While there, she played Wednesday in the school's production of The Addams Family, Cosette in Les Misérables, and Nikki in Curtains the Musical. In July 2016, she was selected as a Triangle Rising Stars by the Durham Performing Arts Center. In addition to being a qualifying event for the National High School Musical Theatre Awards, winners of the Triangle Rising Stars received a $1,000 scholarship and spent a week in New York City performing at Minskoff Theatre, working with Broadway professionals, and representing the Triangle at the Jimmy Awards.
Seiger then attended the University of North Carolina School of the Arts in Winston-Salem, graduating in 2020. While there, she played Wendla in a production of Spring Awakening.

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