From 2000 to 2016, she was a permanent member of the soloist ensemble at the Royal Theater, and performed in Julius Caesar in the role of Sesto, in Rossini's La Cenerentola as Angelina (Cinderella), in The Barber of Seville as Rosina and in Handel's Partenope as Patria Rosmira.
In 2017, she participated in a production of the comic opera Kveiteprinsen at Kilden Theater and Concert Hall in Kristiansand.
[3] In 2014, she released modern jazz interpretations of well-known songs and sang on an album with the Danish big band The Orchestra.
Among the production's lighter elements, Semmingsen wore revolver-shaped earrings visible during her performance.
[2] Semmingsen continued popular movie musical thematic performances as the featured vocalist in a June 2020 Danish broadcast "Divas and Diamonds."