Introduction

[Barbie's_Rush]

Here are all of the NPC sororities that have been at Chico State:

California State University at Chico (Chico State) Chico, CA:
Delta Sigma Epsilon Omicron 1924-1956 Absorbed by Delta Zeta
Pi Kappa Sigma Tau 1925-1959 National absorbed by Sigma Kappa
Theta Sigma Upsilon Omicron 1931-1959 National merger with Alpha Gamma Delta
Delta Zeta Delta Chi 1956-?
Alpha Gamma Delta Delta Iota 1959
Sigma Kappa Delta Iota 1959
Zeta Tau Alpha Theta Alpha 1975-2004
Pi Beta Phi California Iota 1986-2005
Gamma Phi Beta Epsilon Kappa 1988
Alpha Delta Pi Eta Rho 1990

Given that the OP would be in an age range where she has a 17 - 18 year old daughter, she talks about her group's "crazy pioneer days" in a way that sounds like she was there in the early days of the chapter and the chapter closed "many years ago" it doesn't look like it would fit any of the closed NPC chapters there.