A former Prince George’s County school bus driver was convicted Thursday of two counts of first-degree assault for a 2011 incident in which she rammed a bus into the employee lounge at the Accokeek bus lot, prosecutors said.

Theresa Douglas, 41, was “angry with some of her co-workers” when she rammed the bus into the center of a trailer that served as an employee lounge, Prince George’s State’s Attorney Angela Alsobrooks said in a statement. Douglas then got out of the vehicle and waited for police to arrive, prosecutors said.

Police and school officials had said previously that Douglas, who had been a driver for more than 10 years, was denied a protective order against another bus driver, and that is in-part what prompted the incident. They said no students were inside the bus at the time, though three people inside the trailer suffered minor injuries.

Prosecutors said that the night before the Dec. 14 incident, Douglas had posted on Facebook that she was “done fighting, done talking and ready to go to jail.” She was also convicted of one count of malicious destruction of property, prosecutors said.

Douglas had been suspended without pay after the incident, and an Alsobrooks spokesman said she was not working for the school system at the time of her conviction. A Prince George’s school spokesman could not immediately be reached for comment Thursday evening.

Douglas, whose bond was revoked after her conviction, faces 53 years in prison at her sentencing on Oct. 12, prosecutors said.