The Italian Tassis family had settled in what is now Flemmish Belgium, then part of the Spanish Empire where Marie de Tassis had married Hendrik, heer van Berchem. The Tassis postal service linked the Spanish Netherlands to Spain. The Site europeana.eu has this, "Previously identified as Maria de Tassis, she is more likely to be her daughter, Maria Anna van Berchem."
From oldrags.tumblr.com/tagged/17th+century/page/8; filled in shadows and enlarged by half.
Maria Anna is dressed in somber black with splashes of white lace, red ribbons, and jewelry. The bodice ornament is something from a Velazquez (or a Martinez del Mazo) portrait. The cuffs of her over-sleeves are sheer black revealing the lace below, a preview of engageantes to come. The lace modesty piece-bertha is the strongest visual element of her dress. Her dress has a dark gray stomacher section.
Keywords: Maria Anna van Berchem, van Berchem family, Countess, Spanish-Belgian, proto-hurluberlu coiffure, curly coiffure, jeweled ribbon headdress, scoop neckline, modesty piece-bertha, lace, elbow length puffed over-sleeves, slashed sleeves, arm bands, bows, engageantes, three quarter length puffed under-sleeves, stomacher, vee waistline, full skirt, under-skirt, necklace, earrings, brooch, bracelets