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The first things that come to mind when a car just dies while driving are the timing belt breaking and the fuel pump dying.
To check for a broken timing belt she can remove the oil cap and have someone crank the engine with the key, while she looks down through the oil cap hole with a flashlight. If she sees something rotating it means the cams are turning, so the timing belt is still intact. If not she has found the problem. She will have to get it towed to a shop to have the timing belt replaced.
To check for a broken fuel pump (actually you are checking for a fuel delivery problem) she (or you) will have to remove the big tube leading to the throttle body and spray some carb cleaner inside the throttle body. Reinstall the tube and try to start the car. If it now sputters a bit (it may even start for a second or two) where it did nothing before, you have confirmed a fuel delivery problem. The car was actually running on the carb cleaner. Again she will have to have the car towed to a shop for further diagnosis and repair.
There are other things that can cause a car to die while running, but these are the 2 most common.
Mike
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