Colombier grew up in Saône-et-Loire. Her father was author, politician and journalist Jean Bourdier, a founding member of the National Front (later National Rally) in 1972.[1][2] She is the sister-in-law of politician Jacques Colombier. Her husband is originally from Charente-Maritime.
Colombier, a lawyer by occupation, is a member of the bar of Paris.[3] She first joined the youth wing of the National Front, the Front National de la Jeunesse (now known as Génération Nation), in 1974.[3]