She was the daughter of Zénaïde Bonaparte. A genealogical sketch of her is here. Her son is wearing a Scottish plaid sash.
From Wikimedia; spots and flaws removed with Photoshop and removed sepia tone and increased contrast.
The flounces of Charlotte’s dress are edged with lace or netting and it has pagoda sleeves with puffy under-sleeves in high crinoline style.
Keywords: 1859, Disdéri, Charlotte Bonaparte, Charlotte Honorine Josephine Pauline Bonaparte, Comtesse Pietro Primoli de Foglio, Bonaparte family, Primoli family, Princess, Countess, straight coiffure, jacket bodice, high neckline, collar, pagoda sleeves, long under-sleeves, ruffled cuffs, buttons, crinoline, flounces