are both of the rear speakers making the same thumping noise at the same time? do the speakers only make the noise when shes driving alone, or with you in the car, or both?
i dont think you need to test the rear speakers if you say they are working, but you can google speaker test sounds, and burn the files onto a cd. get some of the low frequency test files and put the fade all the way on the rear.
example
http://www.eminent-tech.com/music/multimediatest.html
my guess, is that the wires that run to the back speakers got crushed somewhere - probably closer to the HU. they may be picking up interference if the insulation is cracked. maybe her foot, or a passengers foot, is hitting the carpet, which pulls slightly on the wires, which causes interference to mess with the sound.
hope this helps. oh, the thumping sound might stop if you stop running over ricers on the sidewalk too *thump thump* ;)
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