The Beautiful Woman at Le Vrai was a patron at Le Vrai whom The Merovingian described as "bourgeois" and "boring". As an illustrant concerning his speech about causality, he sent her a piece of chocolate cake containing a code to make her orgasm. Afterward, he met her in the bathroom for a sexual encounter (heavily implied by his wife when confronting him about it to be a fellatio) which caused Persephone to retaliate, and give up The Keymaker to Neo.
Like most others, this woman most likely was found later by Smith clones during their conversion of Mega City and was forcefully infected into being yet another Agent Smith, a very far cry from the beautiful and sexually attractive woman of Le Vrai.