Things to check:
1) Is there MAC address filtering going on with the router? Perhaps your mother's Kindle's MAC address (and other devices) has been approved where yours has not.
2) Is your mother's Kindle the exact same model as yours? If not, is it possible her Kindle is a 3G model and as such, is not even using the wifi router to connect?
3) Do newer Kindles allow you to browse anywhere you want to go on the internet with a Kindle that isn't registered? Is your Kindle registered (I only ask because of all the resetting that was going on)?
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