Shuffle - multiple computers?

Hey, longtime Mac owner (Plus/SE/PB100 etc. all the way up to my current Dual 867 G4 and 1.27GHz iBook), but I've never had a Pod.

Now, I have a shuffle - brand new - in my possession and want to add tunes to it from my iBook. TROUBLE is, the shuffle belongs to my mother and I promised to set it up with her playlists once she goes to FL.

In FL they only have a PC.

Am I in trouble if I put all my songs on it here (Boston) from my iBook and then in November try to set it up on her machine in FL?

**I don't care if the songs I put on it are wiped out, I just need my mother to be able to use it plugged into her computer (PC) AFTER I've used it for two months.

Thanks,

Jeff