 In 2000 Beier was appointed to the Kansas Court of Appeals where she served until being named to the Kansas Supreme Court to replace retiring Justice Bob Abbott in 2003.In 2004 she retained her seat with 702,423 (76.4%) for her and 215,948 (23.5%) opposed.In June 2020, Beier announced her retirement from the Kansas Supreme Court, effective September 18, 2020.