Maud van Rosen found her greatest success in equestrian dressage with her horse Lucky Boy, beginning in 1967 when she came in fourth in the Swedish national championships. In 1970 and 1971 she improved to second and finally captured the title in 1972, just in time for that year’s Olympics in Munich. There, she was eighth individually, but won the team bronze medal alongside Ulla Håkansson and Ninna Swaab.
One year earlier, van Rosen and Håkansson, with the non-Olympian Anders Lindgren taking the place of Swaab, earned the same medal at the European Championships. Van Rosen had also competed in the 1970 World Cup and was part of a notable sporting family in Sweden. Her grandfather, Clarence, Count von Rosen, was an IOC member from 1900 through 1948 (and an honorary one from 1948 until his 1955 death), while her mother, Maud, Countess von Rosen-Engberg, took part in the art competitions at the 1932 Los Angeles Games. Perhaps more notably, however, her uncle (also named Clarence), won individual equestrian medals in eventing and jumping at the same Games.