She will need to download the Kindle app and the Nook app. Once she registers her ipad through the apps she can download her books from her accounts. I believe Smashwords books are viewable with any PDF reader but don't quote me on that one.
You can actually download PDF's straight into iBooks as well. I have Kindle and Nook on my iPad, but I tend to use the iBooks feature more, because a PDF can be a much more beautiful and 'near book' experience.
When she goes to open the file from her iPad, it will ask her if she'd like to 'save in iBooks;. If she does that, a new shelf will be added: Called PDF's (surprise ) where she will then be able to read at her leisure, enjoying a lovely, full color design experience, if that PDF's maker so choice to embellish it as such.
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