Fashion: From the detail on
ladies' dresses provided by Roger Vaughan's site I would say her clothes
look like those of the
ladies from 1871. The lady on the right in this photo has an
almost identical hairstyle and wears a similarly tasselled dress and jabot
plus brooch.
Card: A date of the early 1870s would also fit with the
square corners which don't fit with the 1890s.
And also there seem to have been other photos of a rustic or outdoor
nature being taken in the early 1870s - see Roger
Vaughan's list.