[1] She then practiced as an attorney with Parr, Waddoups, Brown, Gee & Loveless in Salt Lake City.
[1] Hagen was also an adjunct professor of law at the University of Utah, where she taught courses on appellate practice and advocacy and also coached intercollegiate moot court teams.
[2] On June 23, 2017, Utah Governor Gary Herbert appointed Hagen to the Utah Court of Appeals to fill the vacancy left by the retirement of Judge J. Frederic Voros Jr.[2] On February 28, 2022, Hagen's name was among seven submitted to the governor from the Appellate Judicial Nominating Commission.
[4] On March 29, 2022, Governor Spencer Cox nominated Hagen to serve as a justice of the Supreme Court of Utah Governor Cox nominated Hagen to the seat vacated by Justice Constandinos Himonas, who resigned on March 1, 2022.
She was also a member of the Utah Dating Violence Task Force, a Girl Scout troop leader for six years, and vice chair of the Mountain View Elementary Community Council.