I'm sorry you and your family have to endure this, but I really admire how you handled it. It shows what a healthy and strong person you are. I know far too many people who were abused and did nothing, or whose children were abused- and also did nothing! I can't understand that at all, but I also think I would go to pieces in my own grief, and not necessarily be as effective an advocate as you have been- for your daughter, your husband, youself, too. You're really to be commended for putting your daughter first, and doing the right thing, 100%.
You also have the opportunity, by pursuing it through the proper channels, to help several lives - including the boy who did this. Who knows what abuse he might have been suffering or might continue to be suffering that led to this assault? I hope everything is resolved well, and quickly, for everyone involved.