For my Gram, we restored pictures and put a scrapbook together and a family tree.
I found these examples below on line.
When I worked at an assisted living home and one of the residents turned 100, everyone made sure her day was extra special! That night we made a path of 100 balloons from her room to her table in the dining room where she was greeted with flowers, a tiara, and her favorite breakfast. After breakfast, they took her to the beauty salon to get her hair, nails, and makeup done and then took her out to some of her favorite places! When people get that age, it is not the material gifts that mean anything to them, it is people spending time with them and making them feel loved and important!
suggest restoring an old photo of her and her siblings, parents, or her wedding in a beautiful frame. Even finding something of her past that wil spark some sort of warm spot within her. Maybe get the family to take photographs by generations I think that would be the most heart felt gift to look at all of her off springs with pride! Place them all in a nice frame and present them to her this is a gift that is priceless and timeless.
How about collecting favorite memories about Grandma? For our great-granddad, I sent e-mails and notes in Christmas cards (sorry that won't work) and asked relatives, friends and neighbors to put short tales on strips and squares of colored scrapbook paper (you can send them outwith the requests)I also made some put them on paper at a superbowl party. I put them in a clear plastic jar with a cover and a bow. We made a label "Special Stories about Granddad". Because I put them in, I knew some of the funiest, and pulled them in an envelope and read them when we gave him his container. I learned so many things that he had done, and we got to celebrate and laugh while he was alive. He died a year ago today, and I was just reminiscing about that with my daughter. It was a great project! Good luck!