According to her Wikipedia article, she lived between 1590 and 1646. But this is a later 1600s dress and neckline. This is part of a portrait of the Immaculate Virgin. It is unlikely that Luisa ever wore this dress. Her genealogical sketch is here. Photo - Jose Luis Cortés Perruca.
From pinterest.com/akpark09/damas-españolas-siglo-xvii/.
This fuzzy image shows the intricte detailing of the neckline, bodice, and hair ornaments.
Keywords: Luisa de Padilla y Manrique, condesa de Aranda, Padilla y Manrique family, Ximénez de Urrea y Manrique de Lara, Countess, Spanish, straight coiffure, floral ribbon headdress, earrings, bodice, straight neckline, bows, lace bertha, brooch, paned puffed sleeves, jeweled sleeve ornament, flared dissimilar cuffs