You purchased a car for your niece and paid NJ sales tax now she has moved to pa and they are asking her to pay the sales tax in pa even though you paid it already in NJ what can you do?

From the Penn DOT website: "If you hold a valid title issued in another state and, have owned the vehicle at least 6 months before moving to Pennsylvania, you will not be required to pay any sales tax when you register your vehicle in Pennsylvania. If it has been less than 6 months, you will need to provide your sales tax receipt, or remit PA sales tax. Applicants exempt from Pennsylvania sales tax will list the appropriate Sales Tax Exemption reason code in Sections 1A and/or 1B on Form MV-1." Give your niece the NJ sales tax receipt. More information: http://www.dot3.state.pa.us/new_residents/motor_vehicle.shtml