Police say the elderly driver was taking her car in for service when she hit the gas instead of the brakes ... sending her car from the service bay driveway into the customer reception area. The driver has not been arrested.
Two men working at the Toyota dealership were also injured in the crash ... but both are expected to make full recoveries.
As we reported, Katharine left her concert tour in Asia with David the day after the nanny was hit. At the time, she explained she needed to return home to deal with a family tragedy.