It is a great day to be 84!! I am so glad you get to speak with her so often and I hope you really do get to go home and spend her birthday with her. How cool would that be?
I know how difficult it is with the distance, but, as you already know, it is worth every bit of effort and I can only imagine how much it means to your mom!
It will be a great day and a beautiful surprise for my mum i will be looking at flights today :)