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If she can read on your tablet comfortably with Kindle for Android, you could probably do a lot worse than a Kindle Fire. They start at 6 inch, the next is 7 inch, and larger. There will be no problems reading existing Kindle Books.
If E-Ink is preferred, then the Kindle Voyage has a great frontlight and very high resolution text (300 dpi). It is a huge leap forward from her existing Kindle, but still 6 inch. If you prefer a larger screen, the Kobo Aura H2O is probably your best choice. In this case you would need to use Calibre to convert her existing Kindle books to EPub. For those ebooks with DRM (DIgital Rights Management) you would also need to install Apprentice Alf's tools to remove the DRM before you would be able to convert. Reading books with DRM in the actual Kindle format generally requires a Kindle or a Kindle Application. This pretty well means a Kindle or Kindle Fire, or a PC, Mac or Android device running the Kindle App. Otherwise you need to remove DRM and convert to read.
Finally, later Kindles, even the Voyage, do not support Text to Speech, nor does the H2O. I believe Kindle Fire tablets and Kindle software on Android Devices do, but you would need to check this. If you want TTS on an e-ink device, this does limit your choices. In this case I would not recommend the Lynx T68, but a Boyue T62 works well and represents good value for money. But Android is not optimised for either e-readers or e-ink, so battery life is usually much less and some applications do not work well or at all without a colour display. I can't talk about other alternatives off the top of my head, but I'm sure others will contribute.
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