I know some almost blind people, some of them have maginifing readers (do not remember the name). A machine the greatly magnifies the page of a book.
By the New Zealand poster post, I felt that her aunt was thinking of the grandmother listening to the books on Kindle, that is why I thought of audio books, either as CDs or audio books bought off the internet as mp3 files.
I know there are various websites for books. I have never used them so I do not know much about them or all the available formats available.
Gutenberg:The Audio Books Project website (older classic books):