Please make a report. Even if he had a previous case that was closed it will still show up and can help establish a pattern of behaviour which can make it easier to obtain stuff like restraining orders.

And make sure to talk to a lawyer, they can advise you much better than any answer you can get online. You can also ask the lawyer to make sure that any photos he may have uploaded to porn sites or watever are taken down.

Stay safe and make sure to tell the kid that she did the right thing speaking out. Hope it works out for you both.