According to her Wikipedia article; she was the oldest daughter of Isabella of Croÿ.
From eBay; detail-enganced by gogm.
Marie Christine's dress has cap sleeves extending her bertha and almost straight neckline in this Adele photo. Her dress has a slight blouson bodice.
Keywords: Adele, Marie Christine (1879-1962), Habsburg family, Salm Salm family, Archduchess, Princess, straight coiffure, scoop neckline, bertha, cap sleeves, waist band, natural waistline, close skirt, earrings, bracelets