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A Fire was only called a Kindle Fire for short while. It's Amazon's version of an Android tablet and simply has an app like the Android Kindle App pre-installed. An old one is practically junk and you can't copy the Kindle ebooks off to anything else.
An eink Kindle on an account allows downloading to PC (Linux, Mac, Windows) from that account and then there are ways to read the ebooks, or you can deregister your kindle (if a real eink one) and register to your Wife's account and download.
Other possibilities exist. But a Kindle Fire isn't a Kindle and you can't reuse the kindle files off it on anything else.
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