UKDaisy-
I found for my whole COB experience that it was a matter of networking. For some chapters I had the help of alumnae with introductions, others it was through fraternity men I know, and also just on my own. I am a new student this fall semester but due to having a centralized job on campus (the bookstore) I run into almost everyone at some point or another. One chapter invited me over for dinner after I asked two sisters questions on how to get involved with their philanthropy locally, since I had been planning to do so where I used to live. Other clubs and activities (including my oncampus church group) have been places I have run into sisters of a chapter I had already been to, and let me get to know them better. You probably already know a lot of women in sororities, whether you relaize it or not
I think I could have just given my name to the Greek Advisor as well, but this other way really helped me meet new people and get involved at my new school.