Also make it clear, that you're worried about other players doing bad things to her that she might not realize is insanely bad.
When I first would use the internet, my mom freaked out one of my friends typed a little too fast, I don't know if my mom was right or wrong, I don't know how much faster I would of typed at the same age had I had a computer for a few years more, but she was like nope. Block them. So I did.