From Wikimedia; spots and a large flaw on the column removed throughout image with Photoshop. A larger version of this image is available, but it has numerous flaws that I am unable to fix. The dark area around Hedvig's head is probably a flaw and not a hat or headdress.
Hedvig Eleonora wears a black dress broken by just her skin and white under-sleeves in this Ehrenstrahl portrait.
Keywords: Ehrenstrahl, Hedvig Eleonora, Princess, Queen, Holstein family, Vasa family, straight coiffure, off shoulder vee neckline, elbow length puffed over-sleeves, puffed under-sleeves, vee waistline, full skirt, necklace, earrings, brooch, jeweled bodice ornament, clasps, bracelets, regalia