What's the Name of That Book??? discussion

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Cécile
SOLVED: Children's/YA
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SOLVED: YA Historical Fiction set at the court of Louis XIV from the perspective of a young girl at court
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The sickness, however, had not yet run its course: both the Duke of Brittany (now Dauphin) and the Duke of Anjou became ill with measles. The Dauphin was ministered to by the royal doctors, who bled him in the belief that it would help him to recover; instead, it merely weakened the young boy, who swiftly died, leaving the Duke of Anjou as Dauphin. Deciding that she would not allow the same treatment to be applied to the Duke of Anjou, Madame de Ventadour locked herself up with three nursery maids and refused to allow the doctors near the boy.
The main character had grown attached to the children throughout the book, and the most distinct part I recall is her recounting their deaths as the end of an era. I likely read this in the early 2000s.