Who knows? She's just a kid, and it looks like she was on TV, probably a little stress involved. Maybe her mind blanked on her and she just panicked.
Pretty sure that's a more likely explanation, as I would imagine that there were qualifying rounds of pageants that she competed in to get to the one shown. Had she not been able to put together any coherent thoughts in the previous pageants it's doubtful that she would have even advanced.