I don't think there are any ereader brands that prevent hard reset. They usually all give a warning before actually resetting the ereader, though, so even accidental pressing shouldn't be a problem.
Are you sure that she reset it via the settings menu? I believe the Aura ed. 2 can be reset by holding the power button for 30 seconds, and that seems easy to trigger, especially for an older person. All Kobo ereaders have an option for manual reset, but some are harder to trigger than others, like the Touch 2.0 and Glo HD (pinhole reset multiple times) and the older gen Aura, Glo and Aura HD (holding the light button + using the slider several times).
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