At the 2004 Summer Olympics in Athens, Bellenoue qualified for her third French team, as a 29-year-old, in rifle shooting. She had registered a minimum qualifying score of 396 to secure an Olympic berth for France from her outside-final finish at the World Championships two years earlier. In the 10 m air rifle, held on the first day of the Games, Bellenoue fired a modest 392 out of a possible 400 to force in a massive draw with six others for twenty-second place. Nearly a week later, in the 50 m rifle 3 positions, Bellenoue marked a brilliant 198 in prone, and 188 each in both standing and kneeling series to close her Olympic run out of the final in the sixteenth position with a total of 574 points.