EE WAS IN MACK TRUCK BEING LOADED BY A LOADER. WHEN THE LOADER WENT TO DUMP A LOAD OF G ROCK INTO THE DUMP TRUCK, THE WETNESS OF THE MATERIAL CAUSED IT TO COME OUT ALL AT ONCE. THE IMPACT OF THE WET MATERIAL CAUSED THE EE TO GET BOUNCED AROUND INSIDE THE CAB OF THE TRUCK HITTING HER HEAD AGAINST THE DOOR. CAUSATION: POSSIBLY LOADING WET MATERIAL TOO FAST.