Sparkie:
No, they don't. But sometimes we don't understand our own kids, either. It's what they call the "generation gap" only in this case is the "cognitive dissonance" gap. For me: I can't understand the things my kid does sometimes. Yet, at the same time, my parents didn't understand some of the things that I did. I'm not sure if it's all the JW's, the age difference, or the combination of both. My best thought is that it's a combination of both.
Although she gave you the usual JW runaround: twisting words, testing you with all the latest sales scams to get people to convert, you stood your ground and just brought it down to basics. Good for you! If you don't believe in God, how can you pray to something you don't believe in? Doesn't that ring any bells? You can't convert or reinstate someone who doesn't believe in the basic premise of a religion. Won't work. I fail to see how they understand that, but they are taught to persevere and endure.
Thank heaven (oh no! another Christian!) she agreed to come to your graduation! That's enough to be thankful for for now, right? Just let her have a good time and see that all the XJW's don't bite and they won't scar her for life and give her the 666.
Good luck and I'd just chalk this episode up to relatives trying to control your happiness.
Congratulations. Love you.. and remember that it just takes time.
CG