She defeated World Champion Veronica Campbell-Brown in the process and now is the 2008 Summer Olympics silver medalist after she tied with Sherone Simpson in a time of 10.98s.

[3] Stewart ran track and field for Auburn University under coach Henry Rolle at NCCA division I level.

In 2007, she won the Honda Sports Award as the nation's best female collegiate track and field athlete.

[1] Together with Fraser, Simpson, Sheri-Ann Brooks, Aleen Bailey and Veronica Campbell-Brown she also took part in the 4x100 metres relay.

At the 2009 IAAF Golden Gala, Stewart won a gold medal in the Women's 100m in front of Olympic Champion Shelly-Ann Fraser, with a time of 10.75s, which tied the meet record.

Stewart did not compete in the 200m due to an ankle injury, but was anchor for the Jamaican quartet that took gold in the 4x100m Relay.

[citation needed] Having moved back to Jamaica in 2013 to train under new coach Glenn Mills and help to coach the next generation of Jamaican sprinting talent, she competed at the 2014 Commonwealth Games, winning a bronze medal in the 100 m and a gold medal in the 4 x 100 m (with Veronica Campbell-Brown, Schillonie Calvert and Shelly-Ann Fraser-Pryce) in a games record time.