do you have the music stored on your computer's harddrive? if so, it's just as simple as connecting it to the usb and letting itunes copy it over to the new device. just like copying stuff to your iPod now. no issues.
if your'e doing something foolish like copying stuff to your iPod and erasing the stuff from your computer (I know many people who do this nonsense) then you need this guide
you should take her to half price books or something similar in your area. That way she can rip her own stuff at higher bit rates. Be sure you keep all your music and video on a hard drive. You're probably not as meticulous as me when it comes to organizing mp3's and h.264's, but having it on a central location just in case is a plus.