LOL. Thanks for the link. I did P-Wild before freshman year like your daughter and while I didn't get the "outdoors bug" like she did I definitely enjoyed the trip and would recommend it to anyone who's interested.
The "solo" was fun and not nearly as scary as it might sound. You were never beyond shouting distance of your "counselors" and fellow campers. It was 36 hours without food but it was basically you went there and slept. Spent 1 day without food. Slept again and then came back and had a big meal. Counselors came by to bring you water and check that you were okay multiple times throughout the day (if you didn't have direct access to water). I basically just rested cause I was tired from all the hiking!
I'm sure your daughter did not participate in any naked revelry but... I'd wager to say that something of this sort happened every year. I recall 1 night we spent in basically an "A-frame" (our 1 night not in a tent) while we were near the base camp. Another group decided to play a prank on us and they all marched through our A-frame sans clothing. It took us a bit off guard but it was pretty funny. There was also a mass naked walk that took place at the end of the trip.
I don't think anyone was pressured into anything and for the most part it was good wholesome fun.
One of the best meals I ever had was when we stopped at a rest area on our way back from the trip. They had every fast food restaurant you could ever want and I'd spent the past 12 days or so eating food we cooked ourselves that had been sitting in our backpacks forever. Nothing has ever tasted that good.
And I too was a total mess when I returned to campus. in addition to likely smelling disgusting... I hadn't shaved in 2 weeks. My roommate was probably not too happy to see me that day!