Annie, you are incorrigible!

Actually, now that I've had more of a good look at this photo, I'm thiniking of a date later than I first thought (sorry, Sharon

). Maybe as late as 1905-ish, and probably no earlier than about 1895. I'm working on the puffy shoulders, which came into fashion around 1895 - they got huge later on, but an older lady might have kept wearing them even though they weren't the height of fashion at the time.
So, born 1845, photo taken maybe 1900-1910...that puts her in the 55-65 age group. I'd go for the younger end of that range.
Does that help?

Prue