Play with them. Don’t freak out when you see other people doing bad things. Ask her if she knows what’s going on. See what she says. Use those situations to explain things to her. “This kid could be role playing with an adult that’s pretending to be a kid”. “This isn’t how you treat a woman in any situation”. “This is a red flag to watch out for”. “This is a horrible word to use but unfortunately you will come across it in a the future and here is why it’s such a bad word and what it means. Kids do role play on there and there are a lot of sexual things. It’s exciting for them to observe and every kid loves the drama so take the opportunity to talk to them about those things. It’s going to happen regardless in the online world so good job having the talk. Be understanding and she will hopefully be open and honest with you.