Need help with e-book

I found this, dunno if it can be useful... Will try to find more

and this

searching randomly because I don't own one of these and don't know much about them.

You could probably find a Sony TRS-T2 on sale still.

Real question is where you live and is there ebooks available there?

Cheap tablets are also an option.

If she'll be wanting it for actually reading books rather then games and apps, she'll prefer an e-ink reader.
Not only will the battery life be much better, but because it's not a lit screen, it'll only reflect light back much like a real book meaning it'll be easier on the eyes.

Kindle e-inks are nice, they have a huge library ready to download direct from the amazon store built right into it.
Nooks are really cheap at the moment for the simple touch version, they have the barnes and noble store built in but not quite as good as kindle, however they do have micro-usb storage and 250mb onboard that you can put books onto via drag and drop without a problem.

They're the two main contenders imo. Personally, I'd go with a Nook and put her some books on she'd like to read and then let her buy them from B&N store. Very simple.

Then get her a cheap MP3 player :) .. but if you must have music, and want simplicity there really is only the choice of an ipad if she wants a large screen or ipod if she's happy with a small screen.

Kindle, definitely. I've had one for around 4 years, and Amazon's customer service is without a doubt the best I've had to deal with.
The kindle itself is great, and you have Amazon to back it up.