From thepcf.org.uk/artdetective/discussions/discussions/is-this-portrait-of-jane-robartes-wife-of-charles-lambart-1st-earl-of-cavan. If you use this URL to go back to the article, you will find the identity of the sitter is very much in doubt. The Wikipedia article for Jane Robart's husband, Charles Lanbart, has one illustration, a smaller version of this image.
Lady Cavan's (?) bodice has a center ridge and she uses her neckline to display vast expanses of sophisticated lace, including her partlet.
Keywords: 1631, Jackson - Gilbert, curly coiffure, ribbon headdress, lace partlet, vee décolletage, bodice, trapezoidal décolletage, lace collar, rosette, full paned virago sleeves, waist band, vee waistline, necklace, earrings, jeweled collar ornament