Hello!
I was to get my Nana something for Mother's day (I know it makes no sense but my DM, her DD is dead).
So...she doesn't go out, has limited mobility and can't write well or fasten things easily so that rules out anything activity based or jewelery.
I think I've maxed out on little potted plants and she always makes someone get in a cake for us so sweet things not a good idea.
Any more ideas?? Other than a "world's best Nanny" mug. I know it sounds naff but I got my DF one with Dad on it and he loved it.