My Very Bestest Friend in the Entire World is Rush Chair at Pi Phi this year. She is absolutly FAAAAAAAAABULOUSO! We've been Best Friends and Sisters since we were like 8. I know a lot of Pi Phi's through her. They are definitely a wonderful mix of beautiful, classy, talented, and intelligent young women. Hence why she and I get along soooo well!
Anyways, what is your friends name and what yr. will she be? Perhaps I can help you out. One can only rush at Bucknell once they reach Sophmore standing.
Unfortunatly they don't have an Alpha Phi at Bucknell, otherwise I'd rec. them too!!! But besides Pi Phi, KKG is very good, and then I believe comes Tri Delta and AXO. And I don't know about the rest.
Good Luck to your friend!