I think it was all due to the final question...hers was definitely the hardest to answer, and she didn't answer it well. This is the first time I watched the whole show and I have to say I was really rooting for her and cringed when she was asked the question... and how she answered...and the translator didn't help with the way he responded...
I believe she was well ahead with her scores from the bikini and evening gown events, before the final question.