I don't know if you would want to pursue it beyond curiosity, but, there are services that will age progress someone and make an image for you to keep.
The good ones should factor in lifestyle, weight, heredity, etc. Things like, how thick was their hair, did they have medical conditions (other than the obvious), as some medical conditions can cause weight gain or loss, or hair loss: stuff like that. Things like, what did they eat, did they drink alcohol, all of those things can affect appearance over the years.
Without knowing more about how she already looked it's difficult to say more.