I think you guys missed the little detail that she's from England. If what I hear is true about Europe nowadays, it wouldn't surprise me at all if she were the only Christian in her entire school. Is it likely? Not really. But in the face of such hostility from Atheists, if there are any they're probably not too open about it.
On the flip side, Beth, you're in the perfect situation to reach out to those far from God. I wish you the best; stay strong!