A couple of things lead me to credit Mr. C's sighting. Mrs. C said that she saw Elizabeth 'every night' so its not just Mr. C who believes the little girl is Elizabeth. And, they describe Elizabeth's personality the same way her family and teacher do. Outgoing, talkative and friendly. MOO
Is it possible that Elizabeth was on Lake Avenue every evening, talking with the neighbors? It seems unusual. Wasn't she with her family in the evening, or did her family think she was on a bike ride with the neighbors and not realize it meant Meyers Lake?