Representing Switzerland on the international stage, she was part of the early generations of athletes who contributed to the growth of slalom canoeing in the country.

In 1951, Speck won a bronze medal in the folding K-1 team event at the ICF Canoe Slalom World Championships in Steyr, Austria, marking a significant achievement in her career.

[1] Later, in 1969, she competed in the Mixed C2 team event, securing another bronze medal at the World Championships in Bourg St.-Maurice, France.

[2] Speck was a pioneer in Swiss slalom canoeing, representing her country during a time of growing popularity for the sport.

Her achievements at the world championships reflect her role in bringing visibility to Swiss athletes in slalom canoeing.