She didn’t have a personal warning; she attended safety meetings. From the prelim report:
“The ground crew reported that a safety briefing was held about 10 minutes before the airplane arrived at the gate. A second safety “huddle” was held shortly before the airplane arrived at the gate, to reiterate that the engines would remain running until ground power was connected. It was also discussed that the airplane should not be approached, and the diamond of safety cones should not be set until the engines were off, spooled down, and the airplane’s rotating beacon light had been extinguished by the flight crew.”