Olsen played volleyball and soccer in high schoo before starting to play rugby when she was 18 after attending a practice in college and hailing rugby players as some of her "favorite kind of people".
At the University of Michigan, Olsen was a Collegiate All-American in 2015 and 2016 and also earned a nomination to the Collegiate Rugby Championship Dream Team in 2016. In 2017, she appeared in three USA Falcons development tournaments including a five-match exhibition series with Australia, Super Sevens Brisbane and Okinawa Invitational 2018.
Also in 2018, Olsen helped the San Diego Surfers claim a Club Sevens National Championship. Later that year she made her debut on the World Rugby Sevens Series home-stop in Glendale, CO. There, she scored a monumental try at fulltime to help the USA qualify for the Cup Final.