Representing France at the 2005 World Taekwondo Championships in Madrid, she won the silver medal in the welterweight division, losing to Hwang Kyung-Seon from South Korea in the final.
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In Round of 32, she edged out South Korean's favorite Park Hye-Mi, who demolished Icelandic champion Auður Jónsdóttir 22-1 in the first round, in overtime.
In 2008, she participated in the European Takwondo Championships in Rome, Italy, and won the gold medal in the welterweight division, winning over Gwladys Épangue of France in the final.
Graffe, who had been training under Myriam Baverel at the Institut national du sport, de l'expertise et de la performance (INSEP) for five years, had only been entered for the competition a month before the start of the 2012 Summer Olympics following the withdrawal due to injury of Gwladys Épangue.