She was born in 1636 - it is unfortunate that this portrait is undated because it shows a real royal personage in standard royal dress instead of en déshabillé.
Her Wikipedia article is here.
Henriette wears a mantua - a full-skirted dress with an over-skirt caught up in large scalloped sections draped over an under-skirt.
Keywords: Electress Henriette Adelaide, Savoia family, Wittelsbach family, Princess, German, hurluberlu coiffure, scoop neckline, chemise, modesty piece, lace, elbow length full sleeves, engageantes, vee waistline, full skirt, over-skirt, bows, necklace, earrings, jeweled bodice, jeweled skirt, clasps, bracelets, wrap