She was born in Mascouche, Quebec in 1981. Mondor studied at McGill University, later moving to Simon Fraser University to study and train. She had a promising performance at the 1998 IAAF World Cross Country Championships, finishing tenth in the junior race at the age of sixteen. She did not build on these performances, however, and she finished some minutes behind the leaders at the 1999 and 2000 world junior races.