yeah change the battery to start with and replace/clean the terminals. Once its all together, use a voltmeter to see how much charge there is at the battery while the car is running. it should be a little over 14 volts.
If she got the car jumped and it ran after the cables were removed, i doubt the altenator is the problem, because the car would have died out soon after. Also check to see if a light was left on or something else that could have maybe drained the battery.
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