Short answers, pulled from the story.
Louise Florence Pétronille Tardieu d'Esclavelles d'Épinay entered the world on the 11th of March 1726 inside the fortress walls of Valenciennes. Her father held the rank of brigadier of infantry and served as a commanding officer in the region.
Jean le Rond d'Alembert, Baron d'Holbach, Denis Diderot, and Friedrich Melchior von Grimm frequently visited the estate located in the valley of Montmorency just north of Paris. A notable guest named Mozart stayed at the home for two months during 1778 while both Grimm and Madame d'Épinay welcomed him warmly.
Their association became brief yet stormy after she visited Geneva between 1757 and 1759 which transformed Rousseau into her bitter enemy. He later gave unflattering reports about her character in his published memoirs and asserted that romantic inclination lay entirely on her side.
Her pseudo-memoires take the form of an autobiographic romance titled L'Histoire de Madame de Montbrillant which she began writing when she was thirty years old. The text intersperses fictionalized set pieces exhibiting sensibilité with genuine letters and autobiographical material before a mangled version appeared in 1818.
Louise d'Épinay died on the 17th of April 1783 after a long life of literary production. In January 1783, just three months before her death, she received the Prix Monyon from the Académie for her book Conversations d'Émilie published in 1774.