Whakaotihia te rerenga e whai ake nei: I wehe atu a Van Rooijen ki te United States i te Hanuere 2001 ki te ako i te Whare Wananga o Miami. I pupuri ia i tona waahi i roto i te kapa motu i te 2001 World Aquatics Championships i Fukuoka, Japan i puta mai he pouri. I roto i nga relay e rua, 4 × 100 m me te 4 × 200 m freestyle, i whakakorea ia me tana roopu i nga werawera. I tae ia ki tana whakamutunga takitahi tuatahi i te tau 2002 i Berlin i te
2002 European Aquatics Championships i mutu i te 8th i te 200 m freestyle. He tohu parahi ano hoki mo ia i roto i te 4 × 100 m freestyle relay me Marleen Veldhuis, Chantal Groot me Wilma van Hofwegen me te 5th wahi i te 4 × 200 m freestyle. I te 2003 World Aquatics Championships i Barcelona ka ngaro ia i te mētara toa o te ao ma te whakaoti i te 4th i te 4 × 100 m freestyle. I tutuki ano ia i te 7 o nga waahi i te 4 × 200 freestyle. I muri i nga tau e toru ka hoki mai ia ki te kaainga ka kitea he waahi i Dordrecht, me Topzwemmen West-Nederland i raro i te aratohu a te kaiako-akoha a Dick Bergsma engari kaore ia i eke ki nga Taakaro Orimipia o te Raumati 2004 na te whara nui o te pokohiwi.