LINCOLN, Neb. (AP) — Prosecutors are trying to revoke the probation of a woman convicted of attacking a Lincoln high school classmate in 2013.

Sarah Piccolo pleaded not guilty Wednesday in Lancaster County District Court to violating her probation. Prosecutors are citing her pending arson case in Douglas County. Piccolo is charged with starting a fire earlier this month in a bathroom at Metropolitan Community College in Omaha. She’s pleaded not guilty to the felony arson charge in that case.

Piccolo was sentenced to five years of probation for using a hunting knife and a claw hammer to attack a 17-year-old girl at Lincoln Pius X High School in October 2013. The girl was hospitalized.

Piccolo was 16 in 2013 but was being prosecuted as an adult.