Together with Novlene Williams-Mills, Ronetta Smith and Lorraine Fenton she won a silver medal in 4 × 400 metres relay at the 2005 World Championships in Athletics.

Two years later, she won another silver medal in the 4 × 400 metres relay event at the 2007 World Championships in Athletics, this time with Shereefa Lloyd, Davita Prendergast and Novlene Williams-Mills.

The team set a national record in that race, finishing second to the United States in a time of 3:19.73.

At the 2008 Summer Olympics in Beijing, China, Williams won the silver medal in the 400 metres in a personal-best time of 49.39 seconds.

At the 2012 Summer Olympics, she only competed in the 4 × 400 m relay, winning a silver medal with the Jamaican team of Christine Day, Rosemarie Whyte and Novlene Williams-Mills.