Thanks Ian, she will have to reset the device, its the only way to remove the pin
To do this
On the lock screen, swipe from the right side edge of the screen.
Enter an incorrect password ***** PIN (at least characters in length) five times.
You will be prompted to reset your device or wait 30 seconds to try again.
Tap Reset to reset your device to factory defaults.
Once its reset, she then sets it up again and when she registers it with here Amazon account again, all her books will again be available.
If she has forgotten her Amazon password ***** will have to reset it via the link below when she registers isClick me to view
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the screen or smiley faces, that would be greatly appreciated.