Her full name was Armandine Sophie Leonie Corisande de Gramont, although she is called just Corisande. I cannot find much about her. Her grandmother was the ill-reputed Duchesse de Polignac and her mother was the Duchesse de Guiche. Her article in thepeerage is here. Another genealogical sketch is here. Madame Guillotine ran a short article about her, with this image and this image as well that can be seen here.