Seriously, if the PPD are coming up with nothing, the mom needs help in the way of things the PPD will not help her with. If this were happening to my daughter, I would pay a private investigator or a close friend to help me wire tap that apartment she was in and all of the "friends" vehicles she was with that night. There are audio detection devices and bugging devices that can capture conversation going on inside that apartment that can be used from the outside of the building. Also, small gps locators that can be stuck underneath the cars of those 4-5 friends that were with her that night, and under the guy's car that walked her to the garage, and under the boyfriend's car. The things they say behind closed doors might for sure reveal something or a clue if they really know something and aren't spilling the info. One of them might drive somewhere that would lead her to a clue about where she could be. Of course the PPD will not help her do this. But I would do EVERYTHING including all of the above to try to find a clue about her whereabouts. You can get just buy these devices on your own and they work good. Omg, that is just the beginning of where I would start. Oh, would it be an invasion of their privacy to do those things? Shoot, if it was my daughter I wouldn't care, they are the people she was with right before she disappeared. If they aren't saying anything I would find a way to get some clues!