María Manuela Enriqueta Kirkpatrick de Closbourn y de Grevigné, Countess of Montijo by Pierre Paul Emmanuel de Pommayrac
This portrait shows Empress Eugénie's mother in everyday dress from the crinoline era. She married Don Cipriano de Palafox y Portocarrero, a Bonapartist. She moved to Paris in the 1830s and knew Prosper Mérimée who used her as the source of his opera-inspiring novella Carmen.
The Wikipedia article for her is here. The image is from Une Collection Francaise - A French Collection blog.