Sounds like a good project!
There are several mysteries with sorority-house settings.
"The Walls Came Tumbling Down," by Babs Deal, is one of the better-known. I believe she was a KD at Alabama. The story is that the skeleton of a baby is found in the walls of a sorority house being torn down (for remodeling). The novel explores when that happened, whose baby it was, etc.
http://alabamaliterarymap.lib.ua.edu...r?AuthorID=114
"Bitsy Finds the Clue," by Augusta Hueill Seaman, is an oldie--1946. A juvenile mystery, set in Williamsburg. I believe that Seaman was a Kappa; the "women's fraternity" mentioned in the book is Gamma Gamma Kappa, or something like that.
"Poisoned Pins," by Carolyn Hart, c. 1993 --
http://www.amazon.com/Poisoned-Pins-...ion/B003H4I4U4
And there's also "The Student Fraternity Murder" by Milton Propper.
http://mikegrost.com/blochman.htm#Propper