You can't get backlighting on e-ink, because it is opaque, but a different screen technology that offers backlighting might help, as it would have a higher contrast ratio. Does a strong light seem to help her read, if the text is large enough?
The iLiad, with its larger screen and greater control over font sizes (anything PDF will support) might be worth a look, or maybe one of the other new Linux e-ink devices that seem to be popping up everywhere we look these days.
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