I am saying that she should not attempt to go AI, ESPECIALLY by approaching the sorority herself.
Realistically, if she approaches the sorority, the worst she'll get is a no. I'm not encouraging it, but there isn't harm in her talking to the local alum chapters with the hope of finding out more information. They'll tell her what's up.
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From the SigmaTo the K!
Polyamorous, Pansexual and Proud of it! It Gets Better