I'm sure she would rather BUY YOU NOTHING. Just keep your 3DS as it is.Clearly I did, my mother said she would rather buy me a new one, than pay 125$ for the chip :/
Tell her to read this thread, or any similar thread. You're probably acting like it's a big deal, and she can't tell that it's not because she doesn't have a 3DS. yOU DO NOT NEED A NEW 3DS AND YOU DO NOT NEED TO GET THE CHIP REPLACED.