Carnation,
I know that the sorority chapters at Emory are very strong. This past summer I interned with the president of Tri-Delt there. From what she told me, I remember her saying that her chapter had about 150 members, and that that wasn't unusual.
Sorry, I know that it's not much to go on, but hopefully helps a little. If the rest of her chapter are anything like her, than Emory sounds awesome