If she wants a Kindle you should get her a kindle and not a tablet.
None of the tablets are any good for reading books.
! E-ink technology is very good for dedicated e-Readers but my Bluefire
app on my android tablet is customisable and it makes for a good reading experience plus I also get access to audiobooks, e.g. from Librevox
and that's something that a dedicated e-Reader cannot do.