Theisen-Lappen, an Eau Claire Regis High School graduate, began her collegiate career at NCAA Division II Winona State University (Minn.). She totaled five All-America awards for the Warriors, including one with her first-place effort in the discus at the 2011 national outdoor championship. In 2011, Theisen-Lappen was named the Central Region Outdoor Field Athlete of the Year by the U.S. Track & Field and Cross Country Coaches Association.
Following three seasons at Winona State University, Theisen-Lappen transferred to NCAA Division I Indiana State University. She earned three All-America citations for the Sycamores during the 2014 season and was named the Most Outstanding Field Athlete at the Missouri Valley Conference Indoor Championship. Theisen-Lappen concluded her collegiate career by placing ninth in the shot put at the USA Outdoor Championship.