Her Swedish-language Wikipedia article is here.
From the Google Art Project; saved at 200 pixel/cm resolution.
Countess von Königsmark wears a French-style dress with a sleeveless bodice, the sleeves seen here are probably part of her chemise. Her sleeves do not have tight-fitting cuffs. Her bertha streams behind her like a wrap in a breeze.
Keywords: 1654, Munnichhoven, straight coiffure, jeweled headdress, off shoulder scoop neckline, bertha, split bodice, strap sleeves, bows, deep vee waistline, chemise, long puffed virago sleeves, arm bands, full skirt, necklace, brooch, bracelets