once the surprise is over & the KIndle is registered , she can "buy" for zero cost, any of the public domain books direct from amazon to the kindle, without having to go via a PC. Just a suggestion but she may find that simpler: she will have to have an amazon account anyway in order to register the kindle & thus unlock all the features.
free books collections are here;
http://www.amazon.co.uk/b/ref=amb_li...rd_i=341677031