Westrup had a successful amateur career and was part of the Swedish national team from 2001, including the team that finished silver medalist at the 2002
European Girls' Team Championship in
Turin. In 2002, she was third in strokeplay at the
Girls Amateur Championship. She was part of the winning European team at the 2003
Junior Solheim Cup at
Bokskogen Golf Club, and the Swedish team winning the 2006
European Lady Junior's Team Championship in the
Netherlands (with a six-person team including
Anna Nordqvist and
Pernilla Lindberg). Representing Sweden, Westrup was the low individual scorer at the
2006 Espirito Santo Trophy in
Stellenbosch,
South Africa, with a score of 8-under-par 280. The Swedish team finished tied with the host nation, but South Africa was declared the winner, since their third player had a lower score than Sweden's third player, in the third round. The initial tiebreaker, the final round non-counting score of the respective teams, was equal. While still an amateur, Westrup finished runner-up at the 2005
Ladies Finnish Masters a stroke behind
Lisa Holm Sørensen, her best result on the
Ladies European Tour. She won the 2005
Swedish Junior Strokeplay Championship at Jönköping Golf Club, with a 3-under-par score of 277, nine strokes ahead of nearest competitor. Westrup reached the semi-finals of the 2007
Ladies' British Open Amateur Championship, and finished third with
Anna Nordqvist and
Pernilla Lindberg in the team competition. Paired with Nordqvist, she won her final game against the Netherlands 6 & 4 to capture the
2008 European Ladies' Team Championship. ==Professional career==