Just watched it. Although the video quality was crappy, I was listening to her voice. It was DEFINITELY nerves that knocked her off pitch. It's really obvious. It sounds just like someone who's nervous doing karaoke. But other than that, she really didn't do that badly at all. She also hit a lot of the really hard notes. I was surprised that it was most of the easier notes that she was having trouble keeping steady with. For instance, she hit, "Take it easy on me!" fine, but then she was having trouble with lines like, "I admit I cheated," which is pretty straightforward. But it wasn't like she was having trouble hitting high notes. She was just having trouble keeping her voice steady.
But is it just me, or did anyone else think her voice already sounded kind of messed up when she was answering the woman's questions? Maybe that was also nervousness, but it seemed to be really low and timid for her. Usually her voice is more affirmative and commanding, but while she was talking to the woman, I almost thought she was just ready to cry or something. That's how it sounded to me.
I have to say, the whole KTLA thing in general was just really weird. :/

Kisses & Cuddles,
Shuri/Eli