sentences:  She won her first major medal at the 2006 IAAF World Cup, finishing in 12.90 seconds.She first competed in the IAAF World Championships in Athletics in 2005, and reached the final of the sprint hurdles competition at the 2007 and 2009 editions, finishing fifth and sixth respectively.Powell is a two-time US national champion over the 100 meter hurdles, winning the title in 2006 and 2007.