There is a Wikipedia article about the family here.
From the gallery's Web site; removed spots and print with Photoshop.
The sitter wears a colorful small turban with a long tassel and a black evening dress with lace cuffs in this portrait. Her dress has a pleated bertha.
Keywords: 1845, Schrotzberg, von Hoensbroech family, German, straight coiffure, turban, tassels, earrings, necklace, lace-edged chemise, off shoulder scoop neckline, fitted bodice, pleated bertha, floral bodice ornament, quarter length tight sleves, cuffs, wrap