What kind of computer does she have? If she has a Mac, she can download the entire video with TubeSock, and capture the sound with Wiretap Pro/Audio Hijack.
As for windows, check this page out:
Scanning through the posts, here's the recipe I would recommend (haven't tried it personally yet, but it should work). I'm assuming that your friend has no pre-existing sound editing software and no money.
* Enter the YouTube URL here to get the flash video (.flv) file url:
* Click to download. Rename with extension .flv
* Play the downloaded file with FLV Player 1.3.3
* Record and edit the sound with Audacity:
A sound recording tutorial is available here: