Career
Iersel began her career playing indoor volleyball before switching to the beach volleyball in 2001. In 2003 she was selected by the Sourcy Volleybalschool. In 2004 Iersel again qualified for the Under-18 World Championships in Termoli partnering with Margo Wiltens.
This time they reached the semi finals finishing in fourth position.
Later that year she qualified for the Under-21 World Championships in Porto Santo finishing fourth. Iersel teamed up with Marloes Wesselink in 2005 playing in the Eredivisie of beach volleyball in the Netherlands (the highest league in the country).
Their first World Tour event was in Gstaad finishing 57th. Iersel entered the Under-20s European Championships in Israel eventually winning the event and taking her first international gold medal.
A few weeks later at the Under-19s World Championships under 19 in Saint-Quay-Portrieux she finished in 5th position.
He final 2005 event was the Under-21s World Championships in Brazil where she finished 9th. In 2006 Iersel travelled to Marseille to play in a FIVB World Tour event for the first time, finishing 41st. At the European Championship Tour event in Valencia she finished in 21st position.
Later that year she played in the Under-21s World Championships in Mysłowice winning the bronze medal.
She stayed in Poland to play the Warsaw FIVB World Tour event, finishing 33rd. At the Under-10s World Championships in Bermuda Van Iersel played alongside Daniëlle Remmers.
The tournament was shortened from 7–10 September 2006 to 7–9 September because of the Tropical Storm Florence which was likely to hit the island on 10 or 11 September.