She was so poor and finished only grade 6 at her age of 32 according to the caption below the song. I guess she sang that so well bcuz of her anger against the obstacles she has faced through out her life. Believe it or not, she told the judges she doesn't speak nor read English, she just listen to the song so many times and wrote down the accents in Thai and practiced a lot to get the best pronunciation.
https://www.youtube.com/watch?v=aOK4ZDRchhI
