Career
In one of her earliest international senior performances, she placed fourth at the 1999 All-Africa Games. She was selected for the heptathlon at the 2001 World Championships in Athletics and placed 13th overall. She failed to finish at the 2003 World Championships in Athletics.
Simpson reached the global podium for the first time at the 2005 World Championships in Athletics, taking third place with the second best performance of her career with a tally of 6375 points.
She had set a personal best of 6423 points at the Hypo-Meeting earlier that season. She missed the 2006 season but returned the year after with a gold medal performance at the 2007 All-Africa Games.
She failed to finish at the 2007 World Championships in Athletics later that season. She missed all of the 2008 season after this.
She was off form in 2009 and registered a season"s best of 5872 points at the Meeting International d"Arles.
She also managed eighth in the high jump for African at the 2010 IAAF Continental Cup. She withdrew from the heptathlon at the 2012 Summer Olympics due to a kidney infection. Simpson is renowned for her strong javelin throw, her personal best in which is 56.36 metres.