She never had a good voice to start off with and age/time just makes it worse.

A lot of singers now days dont get famous because of the quality of there voice....A pretty face, catchy tune and lyrics that pertain to what evers hip at that time combined with the right promotions is what makes one popular in todays society.....before 2000 we had boyz2men today we have Justin Bieber. LMAO
Dont get me wrong though as I like some of Gwens songs but this topic is about why her voice didnt sound so good on that Christmas special.