The preliminary hearing for a woman accused of threatening Ashley Hall school staff with a gun has been rescheduled.

The hearing for Alice Boland was to have been Thursday, but it has been rescheduled at the request of the defense, prosecutors said. Preliminary hearings are held to determine if there is enough probable cause to support sending a case to trial.

A new date for the proceeding has not been set.

The 28-year-old Beaufort woman is charged with attempted murder in a Feb. 4 incident at the private girls school.

Boland, who has a history of mental illness, is accused of driving to the downtown Charleston school, pointing the pistol at an official and pulling the trigger. The weapon was loaded, but it didn’t fire because no cartridge was in the chamber, authorities said.