It's times like these that I'm glad that NPC rules are more cut and dry than their male counterparts.

Obviously I'm not a guy, but from what has been said on GC, you need a letter from the Fraternity acknowledging your disaffiliation (which you've already got). Whether or not these orgs on your campus gives you a chance, I don't know because attitudes regarding your situation are very much similar to that of steve1869's response.

Still, I've heard of stories from guys who ended up finding their homes in their 2nd attempt at brotherhood, so happy endings do occur sometimes.