In 2003, Falavigna entered a state of depression and even considered trading taekwondo for tennis, but found a new strength to the sport after winning silver at the 2003 Summer Universiade.

In the Repechage semifinals she defeated Italian Daniela Castrignano, but was beaten by Venezuelan Adriana Carmona in the bronze medal match.

[16] In 2005, in Madrid, Spain, Natália Falavigna defeated British Sarah Stevenson in the final, and won the World Taekwondo Championship.

[18] Natália Falavigna performed the oath of the athletes at the opening ceremony of the Fifteenth Pan American Games in Rio de Janeiro.

[22] In the quarterfinals, Natália Falavigna beat the Australian Carmen Marton 5–2,[23] but she was defeated by Nina Solheim of Norway in the semifinals.