I would grab a digital multimeter and start checking the outputs of the throttle position sensor, the IAC motor, and the EGR solenoid.
Another thing to check is for loss of vacuum. Find the vacuum hose routing diagram under the hood and check the condition of each hose. Make sure they are on tight and not spongy. If the appear fine but you still suspect a vacuum leak, idle the engine and spray WD-40 around each hose. If the engine speeds up, you found your leak where you last sprayed.
At this point, if it's still dying, check the operation of the IAC motor. This is what controls idle speed when the gas pedal is not applied.
At that point I'd likely change out the fuel filter, run some injector cleaner through it (I like RXP myself), change the oil, oil filter, air filter, PCV valve, and then pull the spark plugs to check for wear or deposits.
Then I'd tell my neice she really should look into a more reliable car. A Chrysler-Mitsubishi bastard child car is not a great starting point for A to B transportation.