A jury has acquitted Shannon Cooper of Disorderly Conduct, according to officials at Florence City Court.
Florence police arrested Cooper in June for excessive cheering at her daughter's graduation at the Florence Civic Center.
Police say it was announced before the graduation ceremony that anyone who cheered would be escorted out of the building.
School district administrators say parents were sent letters warning them of what could happen if they cheered during the ceremony.
Testimony got underway in her trial Monday afternoon. Closing arguments were heard Tuesday.
It took the jury about two and a half hours to find Cooper not guilty.