I believe this is from about when Marie Anne married in 1680.
From the Galerie FC Web site.
Mlle. de Blois' coiffure does not have the fripon curls required around the turn of the 17th-18th centuries. She wears several jeweled clasps.
Keywords: Vignon, Marie Anne de Bourbon (1666-1739), princesse de Conti, Princesse de Conti première douairière, Mademoiselle de Blois, Bourbon family, Princess, French, long curly coiffure, chemise, trapezoidal neckline, lace, under-sleeves, bodice, vee décolletage, quarter length notched clared over-sleeves, brooch, clasps, robes