After almost nine seasons with FC Twente, she moved to the Division 1 Féminine side Montpellier HSC in January 2016.

On 21 November 2009, Netherlands national team coach Vera Pauw awarded Dekker her first senior cap, versus Belarus.

[5] Despite suffering a facial injury in the last warm-up friendly, a 3–0 win over Northern Ireland, Dekker retained her place in the squad.

[8] Dekker was selected in the final squad for the 2019 FIFA Women's World Cup in France.

The win left Netherlands top of group E.[10] Dekker has a twin brother, Xander.