She was sister to Isabel II and daughter of Maria Cristina. Her Wikipedia article is here.
From Sparganum on Wikipedia; yellowish-sepia tone removed by gogm.
María Amparo appears to be wearing a cape rather than a paletot. Paletots have separate arms that are, in the 1860s, flared.
Keywords: María Amparo, Borbón family, Czartoryski family, Countess, French, bonnet, high neckline, cape, ruching, crinoline