While there are a great many details missing in this story the one that bothers me is the statement that it happen 3 times. Why weren't the parents made aware after the very first time? We have already used this as a teaching moment with our daughter. Do everything you can to avoid it the first time but tell everyone if something inappropriate happens. I feel terrible for the girl and her family.
Isn't it possible the guy told the girl not to say anything, threatened her, maybe the girl was scared, or all of the above. I would not put any of that on the child or the parents.