In your mother's Amazon account, go to:
Your Content and Devices > Settings > Personal Document Settings >
Approved Personal Document E-mail List
Ensure that the email address that you are using to mail documents is added to the above list.
(The from address)
If that is not the issue, you can always plug the paperwhite into your computer and copy the books to the documents folder on the kindle. Or use Calibre's send to device...
Last edited by JimmyR; 08-09-2018 at 01:42 PM.
Reason: Add more info...
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