^ I would try disconnecting the battery for whatever time it takes for everything to reset, then hook it back up. I believe the car is suppose to recognize things that are plugged into it, she might just need a "reset" of sorts to re-recognize the navigation system...
Someone else chime in here if I'm wrong. Regardless, you cant do any more damage from trying the above mentioned. You might search google or this website to find out how long (15 minutes, 3 hours, 2 days, whatever) it takes the car to "reset."
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Marcus
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