Her Wikipedia article is here. Her mother was Princess Therese von Thurn und Taxis.
This portrait of Princess Sophie highlights dress construction, including a pleated bodice without the cover strip normally seen. Her coiffure has curls to the sides, but not in profusion.
Keywords: Sophie von Thurn & Taxis, Maria Sophia von Thurn & Taxis, Thurn und Taxis family, Württemberg family, Princess, Duchess, German, straight coiffure, pleated bodice, bateau neckline, quarter length full sleeves, Empire waistline