She's repeatedly said how she wished she could have more than one playlist, but otherwise, didn't care about the screen too much. Just that the shuffle limited her to one set.
So, the 4g nano should allow her to have her different generas, including some kids stuff for appeasing them. With the screen blanked, it should play about the same amount of time as the shuffle does, and no disc to crash on on impact.
ps, This image is gross and is totally unrelated.
Some of the image is black, so it looks better thru the link or on a non-black background.