I can find nothing about her, other than this portrait, or Monzi. This is a good example of 1600s formal dress.
From artmight.com; made lighter by gogm.
The Countess wears a full hurluberlu coiffure with draping tendrils over a dress resplendent with gold embroidered decorations on her bodice and skirt. Her upper sleeves are adorned with gold followed by virago sleeves adorned with red arm bands and rosettes edged with lace cuffs.
Keywords: Maes, hurluberlu coiffure, scoop neckline, bertha, lace, quarter length over-sleeves, cuffs, virago sleeves, arm bands, rosettes, deep vee waistline, vee waistline, over-skirt, necklace, earrings, brooch, clasps, bracelets