Here's why I think the story takes place in Oklahoma.
In post #214, PS states that
* football is big in the state
* we had an "all state homecoming queen." at the beginning of playoffs they gathered all, and i mean all... of the homecoming queens from all over the entire state to select the "all state homecoming queen."
Both true. One of my friends won All State Homecoming Queen our senior year. (If another state has an All State Homecoming Queen, please post.)
Her last post is #290, where she states "she cannot continue" and apologizes to her family. So we may never find out the end of this mystery.
She also posted that SHE was the 1 who went away to college. So, I think the family is from the Tulsa area. I also know someone who was Miss TU, then Miss Oklahoma (Miss America). I'm going to do some ground work when I go back for Homecoming, as TU will also be having an "All Greek Reunion".
And, of course, I may be COMPETELY WRONG about everything!