http://www.betajournal.com/memberap.htm
That link takes you to an online chapter application, but I'm not 100% positive it's still in use. Some of the links don't go to the sites, and some of the chapters that are listed as not having a website do. Online Xi has links on their page to all of the chapters. They can be found here:
http://bsponlinexi.com/
Some of these sites have email contacts listed so that you can express interest to a current member. If they have openings and choose to let you visit/join, they will help you become a member.
Also, you can register as a Member At Large with International while you are waiting to hear back from a chapter. That way you are a sister, you just aren't affiliated with a chapter yet. Finally, calling International can be more effective than email or applications. Depending on when you sent the application, they may not have gotten it yet. I would call the 816 number found here:
http://www.betasigmaphi.org/ContactUs.php
Good luck!
