My great grandmother, Agnes Susan Lilian Casey
Agnes Susan Lilian Casey was born 14 April 1890. She married my great grandfather Thomas James Morley 31 May 1913.
From the style of the carte de visite I don't believe that this would have been taken much later than the first few years of the 1900s, meaning she could have been no older than her early teens here.
One of 36 images from an album of my own family - see www.flickr.com/photos/whatsthatpicture/sets/7215763159517...