Thursday, an 18-year-old Northbrook girl was sentenced for her role in the May 4 incident.
Cook County state's attorney spokesman Jerry Lawrence says the girl got one year of supervision and 50 hours of community service after pleading guilty to misdemeanor battery in connection with the videotaped melee.
The girl's attorney said his client didn't make an admission of guilt but rather just agreed with testimony witnesses would give at trial.
Fifteen students were charged with the misdemeanor after the incident.
A tape shows junior girls from Glenbrook North High School being covered with mud, paint, feces and garbage as onlookers cheered.