Her granddaughter Clementine married Sir Winston Churchill. Her article in thepeerage is here.
From Paul Frecker
Henrietta Ogilvy appears to be wearing a paletot with notched sleeves over a chemistte with puffed sleeves and, of course, a crinoline.
Keywords: 1861, Silvy, Henrietta Stanley Ogilvy, Stanley family, Ogilvy family, Countess, British, straight coiffure, paletor, high neckline, elbow length flared votched sleeves, chemistte, long puffed under-sleeves, cuffs, crinoline