From her Wikipedia article.
Queen Eleonora's dress has features of late 1600s dress - the on-shoulder modesty piece-bertha, sleeves, waistline, and use of brocade. The hurluberlu coiffure is mid-century and she is not wearing a mantua.
Keywords: 1670, Eleanor of Austria, Eleonora Wiśniowiecka, Eleonore Maria Josefa von Österreich, Eleonora Habsburżanka, królowa Polski, Eleonora Marija Habsburgaitė, Lietuvos didžioji kunigaikštienė, Eléonore Marie Josèphe d'Autriche, duchesse de Lorraine et de Bar, Habsburg family, Wiśniowieck family, Archduchess, Queen, Polish, hurluberlu coiffure, hair jewelry, fitted bodice, scoop neckline, lace modesty piece-bertha, brooch, jeweled bodice ornament, quarter length full upper sleeves, jeweled sleeve ornament, flared lace cuffs, elbow length close lower sleeves, bows, lace forward-back flared cuffs, bracelets, vee waistline, close over-skirt