A woman accused of stabbing a classmate at a Riverland school last year was mentally incompetent at the time, a court has heard.
Amber Brea Rover, 19, was charged with aggravated causing serious harm and recklessly causing harm after she allegedly stabbed a 17-year-old girl at Renmark High School last July.
Prosecutors have previously told the Adelaide Magistrates Court the victim suffered a punctured lung from the life-threatening stab wound.
At the time, both students had to be airlifted to the Royal Adelaide Hospital.
Ms Rover appeared in court via video link from the secure psychiatric facility James Nash House, north of Adelaide.
Prosecutors told the court they were dropping the charge of recklessly causing harm and that they accepted Ms Rover was mentally incompetent at the time.
Ms Rover is yet to formally enter a plea, but the court heard she admitted "the objective elements" of the remaining charge of aggravated causing serious harm.
She was remanded in James Nash House to face Adelaide's District Court on May 17.
