Get her a kindle. I have one, love it.
In reality it does one thing lets you read ebooks, it does it really really well, it keeps lots of them & you can download more easily (inc STW I’m pleased to see).
You can access the web but its shonky. Same with email. But you really can read books on it & it is not heavy so your hands don’t tire like they do with a tablet and it fits in my fleece pocket and the battery lasts for a couple of weeks even if you are on holiday reading lots.