I didn't think she did too bad, just the problems with the high notes, and that one spot where she stumbled on the lyrics. I'm betting it was cause it was so early in the morning and she probably didn't warm up (enough?). Utada's voice is much stronger in the mid and lower ranges anyhow.

I used to sing in chorus in school and the first thing you learn when you have early morning practice is that warming up for a good 15-20min is key, specially for the higher ranges.