{{Fay}}
The crying can be as much for the realization of the loss of a layer of family. I had a weird spell when I realized that I was part of the oldest generation of living people of my family. I'm going to be that great-aunt (or later) that the descendants say, "Huh, Aunt Connie died, we should go to her funeral."
It's sort of like ablative armor against fate, all the layers are removed until you're the one directly facing the universe. I take comfort that my middle sister has well supplied the future with descendants.
Sympathy for the loss of others who felt things for Grandma is also a source of tears.
In any case, weird feelings at a time like this are required. Many trans-continental snuggles.