Her Wikipedia article is here.
From ateliertouchard.fr/index.php/aubry-le-panthou; a row of spots running from top to bottom was removed with Photoshop.
Mme. de Boigne's dress has sheer outer sleves running the full length of her arm over a two segment mameluke sleeves, an early appearance of dual upper puffed sleeves that would be the height of fashion in the 1820s. The sheer over-sleeves may arise at the shoulder or at the blue arm band. She may be wearing a turban and feathers or a feathered headdress.
Keywords: 1810, Isabey, Adélaïde d'Osmond, Adèle d'Osmond, comtesse de Boigne, d'Osmond family, de Boigne family, Countess, French, curly coiffure, feathered turban. veil, scarf, bodice, vee décolletage, dual upper puffed sleeves, arm bands, waist band, natural waistline, close skirt, wrap