For the past 61/2 months -- the bulk of her senior year at Toppenish High School -- the 17-year-old A-student faked her own pregnancy.
Only a handful of people -- her mother, boyfriend and principal among them -- knew Gaby was pretending to be pregnant for her senior project, a culminating assignment required for graduation.
Her teachers and fellow students, except for her best friend, didn't realize they were part of a social experiment.
Neither did six of her seven siblings -- including four older brothers -- her boyfriend's parents, and his five younger brothers and sisters.
"At times, I just wanted to take it off and be done," she says. "I didn't want to go through this anymore."
But Gaby didn't give up the charade until Wednesday morning, when she revealed her secret during an emotional, all-school assembly.
The topic of her presentation: "Stereotypes, rumors and statistics."