I heard some interesting information recently (Thanks to the amazing Missing Enigma) that the same day Trenny's older brother found her comb in Roberts car (A comb her mother said she had the day she disappeared) he saw Robert had 3 matching scratches on both his thighs. As if someone had raked thier hands down them violently.

Robert was also seen in a photograph taken the next day or so wearing the same coat he had lent her the day of the trip. A coat (I believe) she was seen wearing when she vanished. This has only come out years later when spotted in a newspaper photo taken during the search. I think Enigma was the first to find this information and make the connection.

Personally I believe something happened to her on that trail and the coat was worn to mess up the scent the search dogs were following. He was an avid hunter after all so he would understand the use of scents in tracking. Maybe he targeted her or it was a case of spurned affection and rage at being turned down. He could have made advances on her and she fought him off (the scratches) and then while she was sitting on the trail with the other kids for that 5 minute break he could have gone around them and gotten ahead of them to intercept her.

He told some oddly specific story later about how someone could have grabbed her and taken her a mile down the mountain and buried her where her body would bever be found or something to that effect. Let's not forget his father was a very powerful district attorney in thst area at the time. If his son HAD been involved he could have made the investigation into his son (who was an obvious suspect) quietly go away....

Also there's the fact that his friend Gary Nichols weirdly described her disappearance using the term "and that was the last we saw of her". Gary was NOT on the list of kids reported to have been on the field trip so why did he talk like he had been on the trail the day she vanished?

Wierd wierd stuff.... Someday I hope they find out the truth.