Synonymous with Wonder Woman is the Holliday Girls, a sorority that operated out of Holliday College became the Amazing Amazons' unofficial sidekicks. Both were headed by their unofficial leaders, Etta Candy, on each world. In the modern era of Earth-One, these primarily consisted only of a select few gals that joined Etta on their hero's adventures for a short period of time. These three were Tina Toy, Thelma Tall and Lita Little. This quartet would aid the alter ego of Princess Diana in a half dozen cases, then return to lives of normalcy except for Etta who would graduate and join Diana Prince in her clerical job at the Pentagon. On one occasion, Candy would duplicate the process that turned the evil Doctor Psycho into the super powered Captain Wonder by transforming herself into a red-haired Wonder Woman for a brief time in order to defeat the Doctor/Captain and other costumed crooks who had assembled on that occasion.
As for the Holliday Girls of Earth-Two, they had a much larger membership and several more adventures with their Wonder Woman over the years. Etta's primary pals in the group were Eve Brown, Roberta "Bobbie" Strong and Glamora Treat. On one such occasion, these three along with a few others were investigating the sinister Anton Unreal, who had devised an instrument that could project individuals into the fourth dimension. And it was in this reality that two significant things happened. First, that five of the Holliday Girls were transformed into replicas of Wonder Woman and, second, that they began to learn how to phase between dimensions. Among these was the Earth-Two Donna Troy who like her counterpart became a Wonder Girl but didn't join a team like the Teen Titans. She did have several more adventures with her fellow Holliday Girls. This latter skill would be used on future cases, including once when they were summoned to the planet Venus and later still to determine the true culprit behind a rash of crimes.