This is probably Françoise de Warignies who married Bernard de Saint Geran in 1667 according to a French-language Wikipédia article about Jean François de La Guiche.
From isiswardrobe.blogspot.com.
Françoise's husband was a noted soldier and diplomat and her dress reflects military influence with the jacket and jabot.
Keywords: Mignard, Françoise de Warignies, de Warignies family, de La Guiche family, Countess, French, feathered hat, fur, hair jewelry, high neckline, jabot, lace, bow tie, jacket, elbow length close over-sleeves, cuffs, long under-sleeves, full skirt, under-skirt, gloves, earrings