A lot of places do Ipod repair, or you can try it yourself if you're comfortable taking your player apart.
I know that on laptop and desktop LCDs (not very common on desktops because of design) lines are usually a result of a defective cable between the controller and screen. I'd imagine that's the case here as well.
A screen issue can always be fixed if you have the proper replacement parts. It will probably come down to replacement of the screen, the backlight, the connecting cords, or any combination there of. If she's not comfortable doing this himself the options come down to living with it, or paying somebody to fix it.