[1][2] She placed among the top 10 swimmers in the 200 m individual medley at the 2008 Summer Olympics, and has won a bronze medal at the 2004 European Short Course Swimming Championships in Vienna, Austria in 2:13.03.

Leading up to the Games, she cleared a FINA A-standard entry time of 2:12.74 at the Mare Nostrum Arena International Meet in Canet-en-Roussillon, France.

[4][5] Hjorth-Hansen dipped under the 2:12 barrier in the prelims to secure her spot for the semifinals, checking in with a Danish record and fifth fastest time of 2:11.99.

In the 200 m individual medley, she placed fifth in the final by 0.18 of a second behind Great Britain's Hannah Miley, breaking the 2:10 barrier and lowering her record to 2:09.73.

[10][11] She also helped her Danish team (Jansen, Ostergaard, and Friis) to dip under an eight-minute barrier and broke a new record of 7:55.56 in the 4 × 200 m freestyle relay, but finished only in twelfth place overall from the preliminary heats.