Elizabeth Coyan's Picture???

Is it possible that this is a picture of my 3rd great-grandmother, Elizabeth Jackson Coyan?? It certainly is, but we may never know for certain. What we CAN say about this picture that came from the same group of tintypes passed down thru my 2nd great-grandparents, Jackson & Sarah Coyan, is that this is definitely an elderly woman. Estimating that this picture was taken in the 1870's or 1880's and knowing that Elizabeth was born in 1816, it is logical that this could well be her. If so, it is to my knowledge the only picture of her in existence.