In 1958, Haanappel became the first Dutch figure skater to win a continental medal, finishing third behind Austria duo Ingrid Wendl and Hanna Walter at the 1958 European Championships in Bratislava, Czechoslovakia. The following season, she was surpassed by Sjoukje Dijkstra at the Dutch Championships. She took bronze at the 1959 European Championships in Davos, Switzerland, joining Walter and Dijkstra on the podium.