At the 2010 European Women's Handball Championship she reached the bronze final and placed fourth with the Danish team.

[1] Troelsen started playing handball at Skjern Håndbold, but still as junior player she switched to Danish top club Viborg HK.

In 2007 league rivals SK Aarhus signed her, where she broke through to be a first team regular.

But as the club had economic trouble she switched to FC Midtjylland Håndbold in the middle of the 2009/2010 season, despite the fact that she had to play as an amateur in the beginning of her tenure.

As the Danish national team was in saw a lot of key players retiring, including Katrine Fruelund, Rikke Skov and Mette Sjøberg, Troelsen quickly earned a starten spot.