I believe this lovely lady to be posing for her wedding portrait, based on the lovely flowers adorning her bodice. Her position in the Dobb Long Book is directly below Mr. Mysterious, so perhaps they were both sitting for their wedding portrait. She has a rather interesting turn to the pouf of her bangs, and such prodigious bangs they are. They must have been the inspiration for whatever it was we were doing with our hair in the 1980s! Her dress is satin brocade, and I am picturing it in deep red hues.
Hartley has been used by this family a couple times now. On my previous post I linked over to another website showing the back of a Hartley cabinet card that had even more text than this one. Given that this photo also has a bit of a lilac tint to it, I will date this to 1895.