Okay, here is what I heard...
ADPi, Phi Mu and Pi Phi were obviously the first three female orgs. founded. However, they were found without Greek letters and as societies that concentrated on interests such as sewing and reading (this is what I heard, may not be true).
Theta was the first female org. to be modeled after male fraternities by calling themselves a fraternity and incorporating the use of Greek letters from the start.
ADPi, Phi Mu, and Pi Phi later adopted Greek letters.
Then, Gamma Phi Beta came along later when there were already several other groups for women. They were the first to be called a "sorority" though.
Everyone has their firsts!
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