OP - I'm not a member of a D9 org. And I can certainly understand why you'd be upset knowing the history of your college roommate with this other org.
I'm just wondering if there is anything in your sorority's governing documents addressing this. Since I'm sure this isn't a one off situation. I get the fact that technically she might not have been an official member of the other org, but it sounds like she was acting as though she was an official member of this other org.
That's a complicated situation, I hope somewhere out there you can get some more info to make an informed decision on how to proceed.
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