I'm sorry that your Grandmother passed away and you were not able to attend the funeral... I totally get how hard that can be.
When my Father passed away when I was about 14, he was living in Italy and his stupid wife (he remarried) never informed me of his death... It took a little over a year for my father's best friend to realize that I was never notified... But at least when my Mom died ten or so years later, my step dad informed me bluntly as I was coming in the door, wondering what the ambulances and cop car was about... The first thing he said was "Mom died"... He is often bereft of internal monolog and the ability to not say the first thing that comes to mind... so I suppose that zero lag in notification somehow made up for the previous yearlong gap... I don't blame him, he has always been like that... and it has given me many amusing anecdotes to share... Also, many years later when my mom's mother died (the only Grandma I really knew), it took the rest of the family almost a year to remember I existed and that nobody told me... and pretty much the same with one of my uncles... I'm starting to think people don't want me at funerals.
I can see why to some extent... it has always been a thing amongst my friends and I that when one of us croaks, we try as best we can to not be sad and to celebrate that person in a festive and or stupid manner... not to say my family could ever have know about that, but I'm long over that.
I know you probably feel bad about not being able to get to the funeral, but to be honest that is not important... it is the love you had for your grandmother that counts and not whether or not you traveled to see her off... think of how often people travel for funerals but even though they say their goodbyes, they are not really there in spirit... I'm sure its far more important to her that you loved her and know she loves you and have happy memories of her and the times you shared. I think in the end that is all that really matters... we are the sum of the love and sharing we bring to the lives of those we love and care for... as long as that remains, as long as that love and caring is propagated through us passing on and sharing the good memories, happy times and lessons we learned... then that part of us lives on. In that way, regardless of what one believes of an afterlife, that loved one will always be with us.
Be well AlphinaNovaStar.