In a lawsuit, the woman accuses the Fenton High School District 100 board of continuing to employ a teacher and even promote him after his behavior had been reported at the Bensenville school.
The teacher was fired in March over allegations of inappropriate conduct, which allegedly date back to 2011.
Fenton's superintendent, James Ongtengco, was also placed on leave that month amid calls for his resignation over how the district handled the allegations.
ABC7 reached out to Fenton High School District 100 Thursday night for a response to the lawsuit.
The district said in a statement, "we received a complaint from a law firm representing a former student. We don't have any further comment at this time, as our attorneys are reviewing the document."
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