@ElderAve they may be frustrated but the police have worked hard on this.
The challenge in this case is that she has actually vanished without a trace which is incredibly unusual. There is normally evidence to suggest that the person left willing or evidence to suggest otherwise. From that morning when she vanished there is absolutely nothing. (No possessions gone, no money, no passport, no phone used, no getting in touch with friends or family etc etc No one saw anything or heard anything. Nothing to suggest she left against her will....)
For those of you who didn't know about Lean Croucher please share away. Someone somewhere must know something. All her parents want is some kind of closure.