It's possible that this is a photo of Rachel Gurney, a noted beauty of the time. She married Sir William Humble Ward, 2nd Earl of Dudley, son of William Ward, 1st Earl of Dudley.
A description of her by contemporary Australian author, 'Banjo' Patterson is here:
http://www.uq.edu.au/~mlwham/banjo/happ ... udley.html