Just make sure you have another account setup and select the appropriate options in order to sync and move what you want. Its actually very simple. Good Luck!
I don't follow exactly. Could you be more specific? I don't know anything at all about Itunes really, I used it to move PDF's to my Ipad and that's about it.
From the computer side of matters, you should just be able to copy over her music folder (assuming that's where all of her music is) and get away with it.
That said, it's still a good idea to export your Library and Playlists first just in case you need clean copies of those files.
I think that's what I tried to do when I last had to reinstall Windows and it totally screwed it making her have to redo everything, she raged on me for days. Copying the folders only keeps the music itself but you still have to import it....I need to figure out what data file Itunes uses that remembers all of the configurations and settings within it.
She keeps specific songs in specific folders and things like that where Itunes wants to take all those songs and put them into a genre or something like that. So it's not a matter of just importing the folders again, I would need to configure Itunes itself to say, this song goes here...etc. She has gigs and gigs of music so I'm not sure how she has it all setup exactly, I just know my ass is in for it if she has to spend hours trying to remember how it was.
Is there any program that will copy an installed Windows app like Itunes including registry entries and place them back when needed?