I admitt the TV recording thing was my conclusion, but you must admitt that the to versions sounds alot differnt, and there is a time differnce! I have asked other peaople and they do say the same thing, so it´s not just me who can hear two differt versions of the same clip!
But you gotta face it! obviously they did hire someone to sing the song, then they mixed it abit and made it thinner and brighter. that is probarbly why the "artists" name isnt in the credits, since they have remade her voice! I dont think that she sings that high and beautifull in the reality, her voice is fake.