Well I don't have kids but I am an aunt I'd make sure to start teaching her to never get the rats without permission and never stick her fingers through the bars. At her age she might not fully grasp it yet but u can start.
Being very watchful of their interaction. Rats nails can be a bit sharp and they love to climb all over people, I've found it can kind of scare kids as its unexpected I guess.
Hold them and let her pet it slowly and gently. Let them run around on like the bed while she watches.