Lady mistakenly called Marie Caroline Auguste de Bourbon-Siciles by Eugène Appert despot detint
This is not the Duchesse d'Aumale who passed in 1869. I doubt anyone had the clairvoyance to estimate what fashion would do in the 1870s any time in the 1860s. This could also be a composited photo cooked up then or now.
From Wikimedia.
The Lady, whoever she is, shows off a good example of later 1870s dress with fullness emerging from a little above the knee in this Appert (?) photo.
Keywords: Appert, straight coiffure, capelet, lace, high neckline, scoop neckline, revers, stomacher, elbow length tight sleeves, cuffs, vee waistline, over-skirt, bustle, train, ruching, under-skirt, flounces, fan