She discovered a love for horses and for riding in early childhood, and has turned her passion into an occupation. She began in 1994 training on the Swedish stud "Flyinge" with her trainer Kyra Kyrklund, former world champion in dressage.
After four very successful years, in which among other things she won the bronze medal at the European Championship with the Danish team, she had to change coaches as Kyrklund moved to England. She teamed up with Klaus Balkenhol, coach of the German dressage team.
Nathalie gained a place in the 2000 Olympic team as reserve rider, and afterward she participated in the European Championship of 2001, gaining a bronze medal and the World Championship 2002 (where she was placed fourth) with the Danish team. She was a member of the Team Denmark dressage team in the 2008 Summer Olympics and was awarded a Bronze (third place) medal.