Why would she run away with nothing? She wasn't in good clothes for the hike/outdoors. She wasn't even sure there was going to be a field trip that day, according to her mother's account (and apparently no one knew where they were going).
What does being dressed for hiking have to do with getting in a vehicle and riding up the road?
I think Trenny knew exactly where she was going.
She had a good chunk of money left behind in her bank account from her job at the K&W cafeteria, and she left her jewelry behind.
And knowing what we know about Trenny's strict overprotective upbringing are we to believe that Trenny actually had access to that money? Think about it.
I don't know that she did leave her jewelry behind.
The usual consensus in the 70's when a teen went missing was that they ran away. So her peers saying that, without any additional details and anecdotes, does not sway me in that direction.
I know many missing teens are not runaways but some are.
Her peers would have known more details about Trenny than we do.
Not only do I believe Trenny ranaway, I believe it was planned to a T.
I think it was up to Trenny to seperate herself from the rest of the group and make it over to the trail leading to the tower and it was here or at the junction of the AT that she met someone that accompanied her to the road. I think she was out of there before it got dark.
JMO.