Most areas of the country also have an allumnae panhellenic conference which may be able to help. Allumnae panhellenic groups should have at least one member of each major sorority (a delegate) who is usually a different person than the reference person for that particular chapter (at least in my alumnae chapter it is).
To locate a NPC group, try their website:
http://www.npcwomen.org/
Warm Regards,
Paula