I'm glad to hear your meeting went well and that administration appears to be working on it.

My guess is that for the most part this will be the end of things. Students tend to become quite contrite when they realize the adults in the room are on to them and watching, particularly when their own parents and law enforcement have been called in.

The kids involved may continue to give dirty looks and perhaps say things to other students if they think they can get sympathy for themselves, but the actual pranks and direct harassment will probably ease up because they know direct actions/attacks will be dealt with. If your daughter can do her best to just ignore the looks, etc., they'll lose interest and move on. Any direct problems, however, need to continue to be reported (just in case they are slow learners).