A brief genealogical sketch can be found here. Her parents were sympathetic to the imperial cause in Mexico!
His mother, María Pilar Osorio y Gutierrez de los Rios, 3ª duquesa de Fernán Nuñez, can be seen here.
From dinastias.forogratis.es/las-damas-de-la-reina-en-1931-t2621-12; posted by Umberto on 18 October 2011.
This was posted in a Foro Dinastias thread about Queen Victoria Eugenia's Ladies-in-Waiting in 1931, when the monarchy was replaced by a Republic. This is not a 1931 photo. Blouson bodices and close skirts like this one were long out of fashion. I believe this photo dates to the early 1900s. I cannot resolve the pale object draped diagonally across her bodice.
Keywords: Carlota Maximiliana de Escandón y Barrón, Duquesa de Montellano, Escandón y Barrón family, Falcó family, Duchess, Lady-in-Waiting, Queen Victoria Eugenie, Spanish, bouffant coiffure, tiara, feathered headdress, square neckline, elbow length close under-sleeves, blouson bodice, close skirt, robes, quarter length close over-sleeves, train, order bows, choker necklace, necklace, bracelets, gloves, court dress