At the same time, the Duke of Richelieu also began an affair with Louise Anne's first cousin, Charlotte Aglaé d'Orléans, known at court as Mademoiselle de Valois.

The two cousins, rivals in love, would later both fight fiercely, but separately, for the liberation of the duke from his incarceration in the Bastille due to his participation in the Cellamare Conspiracy.

Voltaire, a friend of Richelieu, wrote the following verse concerning Louise-Anne: As the years passed, Louise Anne constantly intrigued for political prominence.

[2] The king did, in any case, enjoy her company, and she belonged to his circle of personal friends and frequently attended court.

She would later sell the lands at Vallery, in the Bourgogne province of France, which had been the traditional burial place of her Condé ancestors.