I cannot find information about someone who might surely be this Maria Grimaldi. However, Giovanna Maria Grimaldi was born in 1596, making this possibly an 11-year old girl stuffed into adult clothing. The relatively large dwarf and dog support that conclusion.
From postila.ru/post/32500454.
Maria’s head appears to be floating in the enormously wide and thick ruff of her saya.
Keywords: 1607, Rubens, Maria Grimaldi, Grimaldi family, Marquise, Italian, curly coiffure, earrings, high enclosing neckline, neckline ruff, supportasse, tabbed fitted bodice, draped necklace, tabbed hanging sleeves, long close false sleeves, ruffled cuffs, full skirt, fan, saya