Obviously sounds like it was lost or worse. I guess you can purchase books but if they have drm on them, you will not be able to transfer them to that kindle since books are coded/encrypted for the specific device. So if you download to a pc, they would be specific to that pc. And since it canNOT be registered you canNOT download for that kindle (normally you can download for a registered kindle)
Can she return it for $$$?