She was the first woman to have a work to which she contributed performed at the Royal Academy of Music in France, Didon.
Her mother was a descendant of the Portuguese royal family, which aided Sainctonge in providing an account of her relative, Dom Antoine.
Saintonge had two daughters—not a lot of information exists on them, however—but she does talk about supporting them by writing pieces very frequently near the end of her career.
[1] Saintonge began her professional career by having a work of hers celebrating the return to health for the king of France at the time, King Louis XIV, performing "Idyll sung in the [royal] apartments for the King's return to health" (Idille chantée aux apartemens sur le Rotour de la Santé du Roi) at court.
In 1696, Saintonge published two works: Poésies Galantes, and Secret History of Lord Antoine King of Portugal, Drawn from the Memoirs of G. Vasconcellos de Figueredo.
Attempting to profit off of the success of the rising genre, Saintonge, and her composer, Henri Desmarets, worked together to form the lyrical ballet.