What did Prince Albert of Monaco's fiancee Charlene Wittstock use to compete in internationally?

Explanation

Prince Albert took over as Sovereign Prince of Monaco on 6 April 2005, when his father Rainier passed away. Known as a bit of a "ladies' man", Albert finally got engaged at the age of 52 to Wittstock, who was a member of the women's 4×100 m medley South African team at the 2000 Summer Olympics, which finished fifth. She finished sixth at the 2002 FINA Short Course World Championships for the 200m breaststroke.