Thanks all for the kind comments.
Sorry Gumby, it was about 5 am here when you last posted...
You're right, she was never exposed to the JWs (or any other "religion" for that matter). She hardly knew her JW grandfather, I had dropped attending church before she was born, her mother was raised in an atheist family in a Moslem country and never was interested in religion.
So she has an outsider's outlook: she loves visiting churches, watching the rituals; she knows some of the stories... as stories. Sometimes you have to tell her: "you know, some people really believe that."
I found interesting too that, in spite of the previous conversation about "G/god(s)," her "prayer" was not addressed to him/them.
And I never heard her wondering about a creator (although she knows that "God" is supposed to fill this "role" among others). I suspect this question (a most "expected" one from the JW perspective) to be anything but "natural". The whole idea of "creation" implies a factitious conception of the world which is hardly a child's notion (if not culturally transmitted).