Welcome, andilubio.
If you want to get books in Spain you can look at some publishers or self-publishers (PDF), the new platform, Leqtor (ePub) and the upcoming platform this week, Amabook (ePub and Mobipocket). Almost all DRM-ed. So, if your mother isn't going to take away the DRM and converts her books to PRC, I think Kindle is not a good option.
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