2012 Ford Edge cruise control problems

Driver: 83 year old woman... New auto: ford edge 2012, no injuries, vehicle damage approx $2000.00 no property damage..... Problem: lady stepped on accelerator rather than brake.... Reason: the brake pedal at rest is higher than the accelerator pedal at rest. The driver is used to an older (chrysler 2009) vehicle which there was not an appreciable difference in pedal height, stepped on the accelerator pedal, thinking she was stepping on the brake....

Gas throttle quit working. Car would not accelerate. Everything else worked. Engine would nor rev when accelerator pressed. See manual light appeared with a wrench symbol on dash. Coasted into parking lot and put car in park and restarted. Everything went back to normal. The next morning, the car did the exact same thing. Took the car to ford dealer and nothing shows up on computer scan and they couldn't replicate they said it sounded like the throttle body,but couldn't confirm.