It would seem that she is being asked to pay the price for NOT letting the dealer do the work. Dealers really hate it when owners use them JUST to find out what is wrong, and then fix it themselves.

Try taking your own oil, where you bought it on sale, to the dealer and ask him to change the oil.........I'll bet the price would be very close to that of them charging for their own oil.........maybe even more, just for spite.