I don't know anyone going, but just wanted to say that my D went several years ago and had a great experience. She also was a rising Jr at the time. Kenyon's campus is very rural and beautiful and safe. I wouldn't worry about her having a travel companion/knowing someone in advance. They did a great job getting the kids, even the less extroverted ones, to get to know each other quickly.
I am sending my younger kid to NYC alone this summer for a program, so I understand your worry--but they will be okay & gain confidence from these experiences.