On a later occasion, however, she also accepted an assignation with the Dauphin, and for a time she alternated as the lover of both who, as expressed by René Louis de Voyer de Paulmy d'Argenson, "sailed to Cythera on the same ship".

[2] In both cases, the relationship was an unofficial one and in no effect was she ever an officially acknowledged mistress to either of them.

For the King the affair was a temporary one; it took place in at about the same time as the King's affair to Irène du Buisson de Longpré, and she was not regarded a threat to the position of Madame de Pompadour.

Maria Josepha, however, reportedly became convinced that the matter was a purely temporary one during her pregnancy and that her spouse would never have an official mistress like his father.

Not long after this, Louis XV had Marie-Louise O'Murphy installed at the Parc-aux-Cerfs.