At the world championships not that successful. She competed in the sprint event at the 1980 UCI Track Cycling World Championships in Besançon, 1981 UCI Track Cycling World Championships in Brno and 1982 UCI Track Cycling World Championships in Zürich. In 1980 she was disqualified after her Chinese opponent said De Neef had rode her again the fence. This was denied however by De Neef, but an official protest from the coach Jan Derksen couldn't change the disqualification. The year later she lost in the first round from a Czech rider. Due to the hair on the legs of the Czech athlete De Neef responded after the race “she probably has swallowed a bit too much hormons”