In the morning of 26 August, when the dauphine went into labour, the king was awakened and rushed to her room, as did 'all who were in Versailles'; some courtiers were present in their dressing gowns.

[7] She was placed into the care of the duchess of Tallard, born Marie Isabelle de Rohan,[5] who had been appointed governess of the Children of France in 1735 and had raised three of the dauphin's sisters.

In February 1754, Marie Zéphyrine reportedly 'enjoyed the most perfect health' and had already attended the public dinner of the royal family a few times.

A scene was relayed in which she 'looked longingly' at a medal that her grandfather the king was presenting to a foreign dignitiary; her brother Burgundy immediately offered his own ribbon to Marie Zéphyrine.

The evening of her death, her body was taken to the Tuileries Palace accompanied by twelve guards who were stationed there as long as she lay in the building.

The tomb of Marie Zéphyrine was among the eleven exhumated on 15 October 1793, and her remains were thrown into a pit containing the bones of Bourbons and covered with quick lime.

In 1817, during the Bourbon Restoration, her brother Louis XVIII placed the fragmented, unidentifiable remains of his family into two ossuaries inside the basilica.