Louise de France





https://en.wikipedia.org/wiki/Louise_of_France_(1737–1787)

She was one of Louis 15’s daughter.
In « Balsamo » from Dumas, it is said she choses to enter the convent of Saint Denis because she thought the monarchy had taken a bad direction: many french people are poor whereas Louis 15 wastes all the money of the kingdom with entertainment and pleasures with women like Mme Du Barry. 
In « Marie-Antoinette » by Pierre Noilhac, it is said that even when she is in a convent, she tries to convince Louis 15 to marry a « good «  lady and to leave Mrs Du Barry.

Marie-Antoinette meets Mme Louise de France when she arrives in France even if she was at the convent. In 1771.
Mme Louise took her religious vows on 12 September 1771 in a lavish ceremony in which the Papal Nuncio presided, dressed in white satin and wearing a million worth of diamonds, in the presence of the king and the rest of the royal family.

Mme Louise hates Mme du Barry. She can be an ally of Marie-Antoinette and can play a role if Lorenza goes to the convent to escape from Cagliostro.