Born in Lagos, Odumosu attended Toybat High school[1] before moving to the United States to study at the University of South Alabama.

[1] 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.

[4] She reached the top of the continental rankings with a gold medal at the 2008 African Championships, taking the hurdles win in 55.92 seconds.

She improved her national record to 54.59 seconds at the competition and secured the silver medal behind Jamaican Nickiesha Wilson, running for the Americas.