Odumosu represented Nigeria internationally for the first time in August 2006, taking part in the World Junior Championships. She finished fifth in the 400 m hurdles final but managed to help the Nigerian women's 4×400 metres relay team (including Folashade Abugan, Joy Eze and Sekinat Adesanyato) the silver medal, setting a new African junior record of 3:30.84 for the event.