Isabel is a member of the sorority Zeta Beta Gamma at the University of California.
When ZBG have their Fall Fling party, D.J., Kimmy, Jackson, Ramona, Beth and the other three members of rival sorority Delta Upsilon Delta crash. Isabel approaches D.J. and Kimmy suggesting they're a little old to be at a sorority party. Kimmy is flattered that she thinks they're only a 'little' old.
Isabel is worried when Kimmy tells the party that they are official representatives from the national charter, who are there on official business, unofficially.
Isabel thinks Ramona would be an excellent candidate to join the Zeta's.