Her article in thepeerage appears to be incomplete.
From bbc.co.
Lady margaret wears a dress that is setting the farthingale era well behind. It has a deeply goffered ruff and a distinct upper bodice section with a partlet overlying an opaque white under-bodice.
Keywords: 1630, Margaret Whitmore, Lady Grobham, British, curly coiffure, hair jewelry, under-bodice, high enclosing neckline, partlet, vee neckline, neckline ruff, collar, rosettes, puffed sleeves, brooch, jeweled bodice ornament