B.S.
Grandmas LOVE to show off their grandbabies!! So be sure to keep her overflowed with pictures of the kids. You can order them online and have them shipped directly to her address. Just the everyday little stuff is what she will enjoy.
Another great idea is a Photo Puzzle of your girls. Again, you can order online and ship to her. The pieces are large and easy enough for her to see, and will help keep her on her toes. If she can't see the pieces, imagine the thrill she will get from having her friends help her put it together.
There are plenty of online crossword puzzles/other games that you can enlarge and print in a size that she will be able to see.
Does she have any hobbies in place? Encourage her to attend all the activities at the home. Also, send her some gift certificates for Hair/Beauty services. Either they will have those services onsite, or they have scheduled trips to an offsite location. Ask the staff to help out on this one. I have noticed that the ladies who continue to pamper themselves seem to make a better go of their situation and stay healthier/more active.
Another idea to keep her company would be one of those photo blanket throws, again of the grandkids. Just having novelty items like that gives them reason to spark up conversations with their hallmates. I truly think that forming those friendships really helps.
If she is religous, the Bible on tape/dvd/mp3 would be nice.
I hope some of this helps. If you need more later, please let us know.