Kallur made her global indoor debut at the 2004 IAAF World Indoor Championships and reached the semi-finals of the 60 metres hurdles. An Olympic debut followed later that year, but she did not progress beyond the heats, coming fifth in the hurdles at the 2004 Athens Olympics. She ended her year with two career bests in the sprints in Gothenburg, running 11.43 seconds for the 100 m and 23.26 for the 200 m.