She arose from the Richekieu family, Duke and Marshal Louis François Armand de Vignerot du Plessis. Her terse Wikipedia article is here.

1763 Comtesse d'Egmont Pignatelli in Spanish Costume by Alexander Roslin (Minneapolis Institute of Art - Minneapolis, Minnesota USA)

1763 Comtesse d'Egmont Pignatelli in Spanish Costume by Alexander Roslin (Minneapolis Institute of Art - Minneapolis, Minnesota USA) shoes
