The Tri Delts ROCK!!!
I am SO happy for your cousin...she will become part of an EXCELLENT organization at Stanford! I graduated from Stanford last year, but I am still in the area, and this really is the best time of the year to rush (fraternity rush is still going on for the next week or so). For me, I was glad that rush is in Spring Quarter (yes, it is the quarter system), because it gave me a chance to check out the respective houses throughout the year, and not just join one because of its reputation. Really, all of the sororities are very special, and Delta Delta Delta certainly has really exceptional women (and a pretty fun house as well-they throw GREAT parties). By the way, there is non-formal rush Fall and Winter Quarters, but not for freshmen (Stanford seem to feel that part of the "college experience" is living in a dorm for at least one year to bond with others, so all freshmen are required to do that-even Chelsea Clinton, Fred and Ben Savage, and Tiger Woods when they were there!)