Wendy Brown, of Green Bay, is charged with felony identity theft after enrolling in Ashwaubenon High School as her daughter, who lives in Nevada with Brown's mother.
The criminal complaint said Brown admitted to telling school officials she was 15 because she wanted to get her high school diploma and join the cheerleading squad.
She allegedly attended practices, received a cheerleader's locker and went to a pool party at the cheerleading coach's house.
The complaint said Brown has a history of identity theft.
There was no attorney listed in Brown's online court records. Her home number could not be found.