Laura does indeed go to the high C. On the OBCR (and I would imagine most other recordings/productions) the song ends one octave lower, but of course this is a special recording, and divas being what they are...
"If there is going to be a restoration fee, there should also be a Renaissance fee, a Middle Ages fee and a Dark Ages fee. Someone must have men in the back room making up names, euphemisms for profit."
(Emanuel Azenberg)