Miss Normandy

Petit was inspired to pursue pageantry at age 17, after meeting Malika Ménard, also from Normandy, whom had been crowned Miss France 2010. Ménard encouraged Petit to pursue pageantry and compete in Miss Normandy.^[9] She later was the first runner-up of Miss Lower Normandy 2015, which qualified her to compete in Miss Normandy 2015, where she placed as the second runner-up.^[7]

Petit returned to pageantry five years later, after she was selected as a candidate for Miss Normandy 2020. She went on to win the title, earning the right to represent Normandy at Miss France 2021.^[10] On 23 October 2021, Petit crowned Youssra Askry as her successor at Miss Normandy 2021.^[11]

Miss France

Miss France was held on 19 December 2020 at Puy du Fou, after being postponed one week from its original date due to the COVID-19 pandemic in France.^[12][13][14] Petit competed in the finals, where she advanced to the top fifteen and later the top five. After reaching the top five, Petit was declared the winner, being crowned by outgoing titleholder Clémence Botino of Guadeloupe, becoming the seventh woman from Normandy to win the title.^[15] During the competition, Petit placed fourth in the general knowledge exam, scoring 14.5 points out of a maximum of 20. The general knowledge exam is a test on topics such as history, politics, current events, and pop culture, which is given to contestants each year.^[16] As Miss France, Petit was awarded a number of prizes and rewards, including more than €57,000 in gifts from sponsors, a year-long residence in a luxury Paris apartment, and an undisclosed monthly salary the equivalent of a senior executive in France.^[17]

After winning the title, Petit was given the opportunity to appear at numerous events in France and internationally. Among these events included being a contestant in Fort Boyard, a guest at the 2021 French Open and 2021 Cannes Film Festival, and working as a promotional and runway model in cities such as Barcelona and Casablanca.^{[18][19][20][21]} Petit also became a weekly cohost on Virgin Radio, presenting a show intending to entertain the French youth amidst the COVID-19 pandemic. In March 2021, Petit was selected as one of 109 women chosen to portray Marianne in an exhibit unveiled by Marlène Schiappa at the Panthéon.^[22]

As Miss France, Petit represented France at Miss Universe 2020, where she placed in the Top 21.^[23] She was originally set to represent France at either Miss Universe 2021 or Miss World 2021, but due to potential date conflicts between those pageants and Miss France 2022, she was instead switched to Miss Universe 2020.^{[23][24][25][26][27]} Petit completed her reign as Miss France on 11 December 2021 at Miss France 2022, where she crowned Diane Leyre of Île-de-France as her successor.^[28]