Hi, missmilliemaam,
Your great-grandmother's face is badly damaged and faded. To give us the best chance of teasing out as much original detail as possible would you able to re-scan it at a higher resolution, please. You may have to play around with the resolution a bit to keep it under Rootschat's 500 kb file size limit, and just remember to rename it when you repost it (just add Take 2 or something to the name).
Cheers,
Peter