Last year the Phi Mus at a large school called one of my AOII daughters, who's at another school, to find out the background on a PNM. She knew one of the Phi Mus, a girl who had gone to a different high school, and was really surprised that members of a different sorority would call her. They wanted to know if it was true that this girl had done some really wild stuff. I have also gotten calls from numerous other sororities about PNMs, although mostly to find out about the girls in general. One sorority at a nearby school called my oldest daughter and me to ask if one of their legacies whom we'd worked with was the wack case they'd heard. (Yep, she slapped one boss and scored another one with her fingernail.
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There's a lot of intersorority help going on around the South, even though gossip would have you think that each group is out to annihilate the others. Most sororities will warn the others if they know about a PNM who's got serious problems.