To characterize the nature of her correspondence, she uses the term “chat”: for the duration of a letter (which usually consisted of 15 to 30 folded sheets of gilt edging, which she described with large, energetic handwriting), she lingered in her mind those she liked, but who lived far away to talk to them casually. Her biographer Dirk Van der Cruysse says: "Had Madame lived in our time, she would have spent her days on the phone". But thanks to her letters we have a unique panorama of court life in the Baroque period and a vivid picture of her personality (and many others) have been preserved. Their descriptions are often less precise, but much more colorful and humorous than those of the Marquis de Dangeau, whose court diary and memoirs made him the official chronicler of the reign of Louis XIV. Nevertheless, she wrote without literary ambitions and not for posterity either: "I write as I speak; because I am too natural to write before I think about it. After answering, she burned the letters she received herself, and probably assumed that the same thing happened to her letters; Fortunately, just under a tenth escaped this".