If they are basing search on the SM's cell phone pings, is it possible that she was smart enough to leaver her phone in a location for a few hours while she was somewhere else completely? Just a thought that occurred to me. IIRC, she is a fan of crime shows, so if she did this, I have a hard time believing she didn't know about cell phone pings. For expample, she leaves the school and drives directly to Sauvie Island. There she leaves her phone in a ditch or someplace where it would not be discovered for a few hours. Then she goes someplace else and does "something," later returning for her phone.