Polkamp also plays for the Netherlands national team and she was part of the Dutch squad that became world champions at the 2006 Women's Hockey World Cup and won the 2007 Champions Trophy.

[1] Polkamp was also a gold medallist in the 2012 London Olympic Games, where the Netherlands beat Argentina, also 2–0.

[1] She announced her retirement from international competition on 3 June 2013, shortly after the AHBC had been Dutch champions.

Polkamp is in a relationship with former Dutch field hockey international Robbert Kemperman.

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