
I'm sorry to hear about your Gran. I remember when mine died, how I felt that one of the rocks on which our family was based was no longer there. I've no idea what you can put in the obit, but if you make an outline of the facts, when and where she was born, what she did in the War, etc, it might spark some ideas. Of course say how much she was loved by all the family, no matter how far away geographically, you were close in spirit.
Good luck with it.