I know it can be a scary place, and as a parent, I know how important it is to keep our kids safe. I've found that one of the best things we can do is to have open and honest conversations with them about what they're doing online. That way, they know that we trust them and care about their safety, but also that we'll be there if they need help with something. It's also really important to talk about what kind of content is appropriate for her age group. You might want to consider checking out https://chekkee.com/14-tips-for-kee...ds-safe-online/ for some great advises on keeping your kids safe online.
It's not enough to just tell your kid to be careful about what he or she does online—you can't watch them 24/7, and you can't protect them from everything. The only way to truly keep them safe is by taking away their ability to go online at all.