My girlfriend has (in my opinion) a fantastic voice. She is also a great guitar player. However she had her confidence knocked a while back and hasn't really played anything since. However, yesterday she plucked up the courage to put a youtube video up so if you could check it out, maybe comment and/or rate it would really help her with her confidence.
The video is at:
practice and better breathing. less head singing and more air coming from the diaphragm, and she will reach her potential.