Dear Imperial Opal I recommend her Memoirs which are very interesting! Great Thread! Here is some information on the faithful Tourzel:
She was born Louise-Félicité-Joséphine de Croŷ d'Havré, Marquise (later duchesse) de Tourzel (1749 - 1832) She was the last governess to the royal children of Louis XVI of France and Marie Antoinette after Madame de pOlignac left the country.
Louise-Félicité married in 1766, at the age of seventeen, to the Marquis de Tourzel. They enjoyed a happy marriage for twenty years, she had six children. Her husband was killed in a hunting accident in 1786.
As you mentioned she was close to die during the september massacre. She was greatly shocked at the news of the death of Louis Charles, and during years she was accosted by various men pretending to be "Louis XVII of France".
here is a portrait of the old Duchess (she was made duchess by Louis XVIII)
