[1][2][3][4] Her father is a French land surveyor, while her mother works as his secretary and comes from the town of Sainte-Marie in Réunion, with Tamil Indian ancestry originating from the Malabar Coast.

[8][9][10] Gilles was educated at Lycée Jean-Bart in Dunkirk, where she aspired to become a neurologist and graduated with her baccalauréat with mention très bien honors in 2021.

[11][12] Prior to becoming Miss France, Gilles was a student at the University of Lille, studying mathematics and computer science with the career aspiration of becoming a statistician.

[11] After ending her medical studies, Gilles spent one semester working at an egg factory in Wormhout, before returning to school as a mathematics and computer science student.

At the end of the pageant, Gilles was declared the winner, being crowned by outgoing titleholder Indira Ampiot of Guadeloupe, becoming the fourth woman from Nord-Pas-de-Calais to win the title.

[31] In the aftermath of the competition, Gilles was the victim of cyberbullying in regards to her physical appearance, with a number of Internet users making negative comments about her hairstyle and body type.

[32][33][34] Following the criticism, Gilles was defended by a number of French public figures, including politicians Sandrine Rousseau and Karima Delli.