Kuusk began fencing in 1992, coached by Helen Nelis-Naukas, Boris Joffe and Kaido Kaaberma. From 2017, Kuusk began training under Peeter Nelis. She has won team épée gold medals at the 2013 and the 2016 European Fencing Championships and a team épée silver at the 2014 World Fencing Championships. In 2013, 2014 and 2017, Kuusk was named to the Estonian Sports Team of the Year.