Her genealogical sketch is here.
From history-of-fashion.tumblr.com/page/216.
The complex dress with busy floral print over-skirt defeats the Maruise. The mass of dark matter on her head appears to be a brimmed hat with dark feathers.
Keywords: 1882, Mélida y Alinari, María del Dulce Nombre González de Villalaz y Fernández de Velasco, marquesade los Castellones, del Dulce Nombre González de Villalaz y Fernández de Velasco family, Losada y Fernández de Liencres family, Marquise, Spanish, curly coiffure, feathered hat, choker neck band, split princess bodice, high vee neckline, floral bodice ornament, sheer lapels, three quarter length close sleeves, lace engageantes, bracelets, over-skirt, lace ruffles, tight flounced under-skirt, gloves