I would say get her a prs-650 (good build quality, audio playback capability, built-in dictionary, touch screen, no proprietary file format, google books support, library support...it's just awesome!), and then sign her up for the Free Library of Philadelphia
see post here
https://www.mobileread.com/forums/showthread.php?t=93451
here's their e-collection page. See if she likes it
http://freelibrary.lib.overdrive.com...owseeBooks.htm
I threw in my application form a few days ago. They replied to say they've got it, and it took 6-10 business days to process. I am now waiting happily. Took a little fussing around, but only at the beginning. I wish someone did all these for me when I was 12!