If you're not in a major city, Alumnae panhellenics are pretty rare. Birmingham doesn't have a fully operational one yet.
But if all she's done is e-mail and Facebook, all resources have not yet been exhausted. You have to TALK to people...in person and on the phone.
Also, you can go to the university's news bureau, type in "sorority pledging" and find previous year's lists of new members. Look through those for somebody from your town, or at least close to your town.
You can find that person and ask who did their recommendation.
Another method - go to your local newspaper website, and search for your chosen sorority name, and see what comes up. It may not work, but it's worth a try.
Don't give up. It's still early.