From what I have seen, she was the second marquise de Castellflorite, the sole daughter of the first marques. She had no children.
From Google Art Project via Wikimedia.
Marquesa Luïsa’s dress has a stomacher section under a pair of vee-shaoed straps decorated with bows ending in a vee waistline.
Keywords: 1880, Caba, Lluïsa Dulce i Tresserra, marquesa de Castellflorite, Dulce y Garay family, Marquise, Spanish, curly coiffure, earrings, chemise, high neckline, ruffled collar, bodice, stomacher, bows, revers, elbow length close sleeves, cuffs, vee waistline, skirt, drapery