The style represented just isn't 1645.
From the lost gallery's photostream on flickr; sepia tone removed and contrast increased.
Henrietta Maria wears a proto-hurluberlu coiffure - flat on top and loaded with curls on the sides, but the side curls still lay flush to her head. Her sleeves emerge from an annulus that is a tabbed sleeve without the separate tabbed segments.
Keywords: Queen Henrietta Maria, British, Bourbon family, Stuart family, Queen, hurluberlu coiffure, proto-hurluberlu coiffure, hair jewelry, chignon, collar, high neckline, trapezoidal neckline, partlet, stomacher, tabbed sleeves, full sleeves, necklace, earrings