We bought an MP3 player for our younger daughter for Xmas.
If I understand your question correctly, you want to rip tracks from CDs to her player.
I used WMP 11.
Connect the MP3 player to a spare USB port. Launch WMP and stick the CD in the CD drive.
In WMP, go to 'Rip' and WMP will start saving the tracks to your Library.
Now go into 'Sync' and you will see the CD and all the tracks listed.
You can now drag your favourite tracks into the 'Sync' area.
Having selected all your favourites, click 'Start Sync' and they will be saved to the MP3 player.
Any tracks that you don't save to the player can now be deleted from the Library/PC to save HDD space.