I don't see how the neighbor was "alerted", if not by the bike, deserted on the road. He/she would have no idea whether she returned or not, unless having eyes trained on the house for hours. yet LE is not asking for info, ie sightings, of this bike ride. of course, the kids may not have been able to get ahold of mom and asked the neighbor to do a check. He/she may have been familiar with the bike, and noticed it was gone from the garage for example. But how would that have raised the "missing person" alarm so soon? that part makes little sense. Wouldn't the neighbor have returned to the caller and said, "yeah the bike is gone, she must be out riding." My conclusion...I dont think that LE is convinced of the bike ride story. I think the neighbor, unless having gotten a call from her family to do a check, is probably the focus right now. JMO. and again, I dont get turning away volunteer searchers...maybe someone has a sensible theory.