There is a simple fix/solution to this type of problem. 1. Monitor your children when playing. 2. Tell your child not to tell her age to people. Any game online there is gonna be people that do stuff like that and all that you can really do is ignore them, because you can never get rid of people like that because anyone can always change your ip, vpn and etc. If you daughter is experiencing that in a game it's best to leave that game lobby and go to another and just to avoid people like that.