In 2006, she set a personal best time of 2:23:38 winning the Boston Marathon, she took the title at the Paris Half Marathon, she won the bronze medal at the 2006 World Road Running Championships, she was fourth at the New York City Marathon that same year. In 2007, she finished fourth in Boston, attempting to defend her title, and was quoted as saying, "I never felt good in the cold. I couldn't get my body in a rhythm." She won the Lisbon Half Marathon that year, later going on to take seventh place in the marathon at the 2007 World Championships in Athletics. She ended her 2007 with a new course record at the Obudu Ranch International Mountain Race, earning US$50,000 as a result.