In addition she won a silver medal in 4 x 400 metres relay at the 2006 World Indoor Championships.
She qualified for the 2008 US Olympic team by winning the final of the 400 m hurdles at the 2008 US Olympic Trials in Eugene, Oregon.Her personal best time for the 400 m hurdles is 53.28 seconds, achieved in June 2007 in Indianapolis.
Williams returned to form in 2012 running 55.01 her fastest time in 3 years in a meeting in Turkey.