Her Wikipedia article is here. The article has a picture of Empress Augusta of united Germany, Queen of Prussia.
From Wikimedia; spots in background removed with Photoshop by gogm.
Crown Princess Auguste wears a simple Directoire-type dress, but made with satin. She wears a headdress that could be called a turban strapped around her neck as well as a bow behind her head.
Keywords: 1800, Böttner, Auguste of Hessen-Kassel née Prussia, Hohenzollern family, Hesse family, Princess, German, curly coiffure, square neckline, tight sleeves, waist band, Empire waistline, close skirt, wrap