She also won the 1981 IAAF World Cup event, took the silver medal in the hurdles at the 1980 World Championships in Athletics, won the bronze medal at the 1983 World Championships and finished sixth at the 1986 European Championships. At the 1983 World Championships she also won a gold medal in the 4 × 400 metres relay. Although it was Gesine Walther, Sabine Busch, Marita Koch and Dagmar Rübsam who ran in the final, Fiedler had run in the qualifying round.