Why didn’t the girls call police when the first few forced their way in? Call police, then your daughter and friends should have started taking pictures.
Then hand the pictures to the police and let them track the people down. If one of the people there was the person who set it all up – then there would be leads…
Personally, I think one of the girls thought it would be ‘fun’, but it quickly got out of hand. This is probably why the delay in the police. I think they would have immediately called if the forceful entry was a complete surprise.
I vote for video security system – hide the controller and hard drives that the system uses (don’t use attic because the heat damages electronic hardware)