I don't know how adjustable the Sony's are but you might want to look at something like the 950. It has a 7 inch screen and can read ebooks. You could play with one at Best Buy and see if it lets you play with it enough to see if it can be adjusted.
On the other hand, the Kindle also has Text to Speech which might be something that helps your daughter keep up with her reading if her eyes get tired or she is struggling with reading.
Good luck
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