There seems to be some confusion here.
All you need to do with the Nano is install iTunes onto your computer and it will then list all the songs already on your machine. The iPod can then be connected and by use of 'playlists' your daughter canchoose what she wants downloaded onto the Nano.
If you purchase music CD's in the future these can be added (ripped)to iTunes and added to the Nano.
iTunes comes with access to Music Store which lets you (if you want to) buy LEGAL downloads of music.
FYI, in case you don't realise, Limewire is a p2p download site where the overwhelming majority of downloads are done in breach of the prevailing copyright laws.