SWTMom,
I agree with what the others have said. Contact the Alumnae Panhellenic Council in your city and let them know about your daughter. They can either put you in touch with some alumnae in those organizations, or they can get you to send in a copy of your daughter's resume (and a picture) and they'll get in touch with the alumnae themselves.
Also, have your daughter ask her teachers, friends' moms, church acquaintences, etc., about their Greek affiliations. There are a lot of Greek alumnae out there, but many of them won't announce their affiliations unless asked.
Good luck! Please keep us updated about your daughter's Rush experience -- and feel free to have her visit GreekChat to read up on Rush information. There are LOTS of Rush experts on this board!
Greek Love,
dzrose93