Wikipedia has nothing about her, but Yseult provided information about her in the Alexander Palace Time Machine Discussion Forum here.
From Wikimedia.
Not many portraits on this Site match fashion plates of the day, but this one does. She wears a wide-brimmed hat with a liner secured with a bow and ruched bands, a ruff and lace collar, a pelisse or capelet shoulder cover, wide lace epaulettes, a wide belt for a natural waistline, gigot sleeves, and a full skirt.
Keywords: 1832, Lépaulle, Princess Maria Elisabeth Amalie Franziska, Wittelsbach family, Princess, feathered hat, liner, bows, high enclosing neckline, ruff, collar, lace, pelisse, epaulettes, gigot sleeves, belt, natural waistline, full skirt, shoes, pin, necklace