Maria Theresia, later Princess of Hohenzollern-Sigmaringen (1867-1909)
According to her Wikipedia article, her mother-in-law was Antonia of Portugal. She bore two sons and a daughter, Augusta Victoria who married King Manuel II of Portugal.
From royaldish.com/index.php?topic=7247.0.
Maria Theresia's dress is easy to date based on her enormous leg-o-mutton sleeves covered by her wide double or triple lace bertha.
Keywords: Maria Theresia Borbone-Hohenzollern 1867, Borbone family, Hohenzollern family, Princess, German, trapezoidal neckline, bertha, lace, bows, leg-o-mutton sleeves, necklace