The date is assigned based on the Wikipedia article for Duchess Elsa who was engaged to marry Prince Alfred, but did not go through with it.
From spanishroyals.tumblr.com/page/44.
Hourglass figures were becoming passé in the later 1890s. Bee wears a corsage while Elsa's dress has a bertha.
Keywords: Princess Baby Bee Beatrice, Elsa of Württemberg, Welf family, Wettin family, Borbón family, Württemberg family, Lippe family, Princess, Duchess, straight coiffure, bertha, long upper puffed sleeves, cuffs, criss-cross bodice, blouson bodice, belt, natural waistline, close skirt, bustle, floral bodice ornament, earrings