If an YouTube Account get hacked :
http://support.google.com/youtube/bin/answer.py?hl=en&answer=175276
Scroll down to that Page and then press on Account Recovery:
https://www.google.com/accounts/recovery
I can`t believe that YouTube just left her in the Rain when we have used that Option like a dozen of times over the last couple of Years and it did worked always and everything was always set back to the state it has been before the Hack happened.
Did YouTube at least told her why they couldn`t rewind it?
Note:
If you use the Recovery be aware that you will get to answer a lot of Questions about your YouTube Channel so if you aren`t the Owner of it and are just doing it for someone else be sure that the Owner is either sitting right besides you over the hole time or you have them on the Phone because some of those Questions can probably only be answered by the Owner.