She served as the royal governess of Napoleon II from 1811 until 1814.

[citation needed] In 1780, she married Anne-Pierre de Montesquiou-Fézensac.

Her spouse was first equerry to the Count of Provence before the French Revolution, and was appointed First Chamberlain to Emperor Napoleon I of France in 1809.

[citation needed] Louise was however appointed governess to the infant son of Napoleon and Marie Louise, the King of Rome, he would often nickname her the name “Maman Quiou.” Louise also accompanied him during his trip to Vienne, Isère after the abdication of his father.

Louise later died in her childhood home; the Château de Courtanvaux, at the age of 69.