An article in The Anne Boleyn Files asserts, "'The Lady Parker' a portrait once thought to be Jane Parker but which is probably Grace Newport, Jane's sister-in-law.” The Royal Collection identifies this "Grace, Lady Parker” and thepeerage shows a black and white photo of this portrait with the article for Grace Newport.
This portrait appears on the Internet as Jane Parker, Lady Rochford. Jane Parker, Lady Rochford's article in thepeerage is here and her Wikipedia article is here. Given the family she married into and her association with Katherine Howard who went the way of Anne and Anne's brother George Boleyn, it should come as no surprise that she was literally whacked by an executioner.
From pinterest.com/douglasspeakman/tudors/; enlarged by half.
The neckline could be a crescent containing a partlet with a wide collar tucked under her arms or a truncated pyramid. The sleeves are very likely to be puffed at the bottoms and the dress probably has a vee waistline.
Keywords: 1540, Holbein the Younger, Grace Newport, Lady Parker, Newport family, Parker family, English, straight coiffure, French hood, veil, split partlet, high vee neckline, collar, long bottom puffed sleeves, fitted bodice, square neckline