Madame Royale was "exchanged" for French prisoners and went to her Austrian relatives. Later, she married her first cousin, Duc d'Alencon, younger son of her uncle, Charles X, king of France after the restoration. After the assasination of the older brother, Alecon became king very briefly. So, Madame Royale, to legititimistes, was Queen of France- for about 20 minutes. She later died in exile, peacefully.