She was educated by her maternal grandmother, and in 1737 married Louis Marie, Marquis de Créquy (1705-1741) — author of the Principes philosophiques des saints solitaires d'Egypte (1779) — who died four years after the marriage.

[2] De Créquy devoted herself to the care of her only son, who rewarded her with an ingratitude which was the chief sorrow of her life.

She had none of the frivolity generally associated with the women of her time and class, and presently became extremely religious with inclinations to Jansenism.

This story, widely believed in France,[citation needed] is her statement, with a detailed story to back it up, that Britain's national anthem, "God Save the Queen", was in fact written by Lully and sung by a French girls' school to greet Louis XIV.

[citation needed] The French author of Souvenirs further states that the tune was later plagiarized by Handel and sold to the British crown as their anthem.