Scherwin threw the javelin at the Athens 2004 Summer Olympics and the Beijing 2008 Summer Olympics. Her biggest success was at the 2005 World Championships in Helsinki, where she threw the javelin 63.43 meters, placing fourth overall in the event. She finished second at the 2003 World University games in Daegu, sixth at the 2005 World Athletics Final in Monaco, fifth at the 2006 European Championships in Gothenburg, and third at the 2006 World Athletics Final in Stuttgart. In her junior years she placed 6th at the 1993 European Junior Championships and 5th at the 1994 World Junior Championships.