Lacour took up rhythmic gymnastics at age 6 in Corbeil-Essonnes, During her career her strengths were expression, dynamism, originality and apparatus handling.

[6] With the start of the new Olympic cycle Aurélie competed at the 2001 European Championships in Geneva, where she was 17th with ball, 15th with clubs, 10th with hoop and 13th with rope.

[6] In September she competed at the World Championships in Budapest along Nathalie Fauquette and Ketty Martel, finishing 21st in the team category and 115th in the All-Around as she had for forfeit after two apparatuses.

That year she was the national runner-up behind Ledoux, also winning silver with rope, ribbon and clubs and bronze with ball.

[14][15] In October she was selected for the World Championships in Baku ending 12th in the team competition, 37th in the All-Around, 40th with rope, 51st with ball, 32nd with clubs and 31st with ribbon.

[20] In 2007 Aurélie and the group competed at the World Championships in Patras, they were 16th in the All-Around, thanks to a bad execution of their 3 hoops + 4 clubs' routine that ranked them 22nd, and therefore they didn't qualify for the Beijing Olympics, they were 8th in the 5 ropes finals.