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If it's an Amazon-bought book, it's very likely DRM.
The way to send it to your mom's Kindle without stripping the DRM is to have her temporarily deregister her Kindle, then you register her Kindle's serial # to your Amazon account.
Then from your Manage Your Kindle page, either use the "Transfer via Computer" option for the book and pick your mom's Kindle as what the file will be encoded for and download and email it to her, or maybe use the easier option of just plain "Send to [Mom's Kindle]" via Whispernet.
Then after that you can unregister her Kindle from your account and she can re-register it to hers.
Hope this helps and welcome to MobileRead!
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