Darcos is the great-granddaughter of Colonel Émile Driant and also a descendant of Georges Ernest Boulanger.

[1] Darcos obtained a degree in history from Paris-Sorbonne University (1993), before taking classes at the École du Louvre from 2005 to 2007.

In 1990, Darcos began her career as a trainee in the Le Quotidien de Paris, then in two political communication agencies (Modus Vivendi and P.O.L.I.S.).

From 1997 to 1998, she was then in charge of the mission of the director of the book and reading, Jean-Sebastien Dupuit, before becoming parliamentary attaché of Xavier Darcos, senator of the Dordogne from 1998 to 2002.

In the 2017 parliamentary elections Darcos ran for Essonne's 5th constituency[3][4] but eventually lost against the mathematician Cédric Villani, the candidate of La République En Marche!