I've played a little more simply because of the appeal of the photograph. I believe it to be very restorable especially with a large image to start with. I've worked on one of her hands and slipped in a backdrop. The classical style backdrops were very popular in studio photos of the era so it should not be too out of place. The opacity is dropped to around 30% which allows original background damage to come through, the purpose being to integrate it into the photo further. There is still a great deal of patient work to be done cleaning up areas. I added a slight sepia overlay just to give you another aspect of what could be done for your photo. A pleasure to work on, but for this purpose, I can't afford much more time on it. I do hope it does give you hope that great grandmother can be restored to a very reasonable standard.