Mondor won the Fukuoka International Cross Country in March 2003 with a time of 18:51 – one of the fastest recorded on the course. A twelfth-place finish at the 2003 IAAF World Cross Country Championships confirmed her one of the better cross country runners of her generation. She finished twelfth in 5000 metres at the 2003 World Championships in Athletics, and near the close of the season she became the first Canadian woman to dip under 15:00 in the 5000 m. She improved further in cross country the following year, finishing in eighth in the long race at the 2004 IAAF World Cross Country Championships and thirteenth in the short race at the same competition.