Mmmm. I had to have a long look at this, however I don't think as late as Edwardian in spite of the pigeon-breast looking bodice bib.
The " come back" sleeve was fuller & looser than this.
So around early-mid 1890's I would suggest, her hairstyle is typical of that decade & you won't see it as late as 1905, also there appears to be a small bustle back there which had faded in popularity around 1890 although yo can still see them up to mid 1890's.
If you know who they are they are married at this time & if you don't know who they are they are well.... married at this time.