Her adult personal correspondence has been collected; I've written about it before, on LJ, I think. But I haven't seen anything (certainly, anything translated) from when she was younger.

When I was a young teenager -- especially eighth grade through say, sophomore year -- arguing about religion (belief versus atheism, atheism versus Catholicism, Zionists' desire for a state versus a secular state, Vatican City as a state) was all fuel for my most enjoyable polemicizing. And I was rude, and baiting, back then. I would LOOK for biblical literalists in order to argue viciously with them. God, I'm glad I'm past that.