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What you describe sounds like a PATS key issue. That that means is the vehicle's computer has lost communication with the key and won't allow the engine to crank.
The issue could be in the key- it's not sending out a signal, the device in the dash that receives the signal from the key, or the vehicle just lost programming for a second.
Has the vehicle been sitting for a little while?
Does she have a spare key that she could try?