This was probably made around 1860, based on her sleeves.
This wonderful print was posted to the Alexander Palace Time Machine Discussion Forum by Grand Duchess Ally on 20 April 2009.
Maria Alexandrovna's jacket in this print appears to have a tan outer layer, a white middle layer with dark buttons, and a tan inner layer. Her dress probably has a black band running from waistline to hem.
Keywords: Tsaritsa Maria Alexandrovna, Hesse family, Romanov family, Tsaritsa, Russian, straight coiffure, lace headdress, scarf, high neckline, collar, lace, jacket, pagoda sleeves, under-sleeves, buttons, waist band, full skirt