The maggots will work well but the tissues have to be rotten first. Maggots will not eat healthy flesh. One thing you can do is get a drill and a light metal coathanger. Drill about a half inch hole in the bottom of the skull. Insert the coathanger in the skull and let her rip. The hanger should bend up a bit when you start the drill and tear up the brains. I havn't actually tried this, It just came to me. But I think it would work pretty well. Just a thought.