It took some searching, but her genealogical sketch is here.
From collections.chateauversailles.f/downloadimage.aspx?server=10.0.10.13&port=14456&filename=objectimages/90-004061.jpg&maxwidth=2000&maxheight=2000; hairline tears or cuts and spots removed with Photoshop.
Henriette steps on to the ground with her satin slipper wearing a velvet A-line dress that appears to take a ruff and under-sleeves from her chemise.
Keywords: 1813, Gros, Henriette Scherrer, Henriette Scherer, comtesse Legrand, Scherrer family, Legrand family, Countess, French, straight coiffure, bun, jeweled headdress, veil, ferronière, necklace, chemise, square décolletage, modesty piece, neckline ruff, quarter length full under-sleeves, bodice, quarter length notched full over-sleeves, jeweled waist band, jeweled pendant chain, jeweled pendant, Empire waistline, A-line skirt, shoes