Widely regarded as the most powerful tumbler of her generation by critics and fellow competitors alike, the gymnast had two eponymous skills added on the FIG code of points after being the first woman to compete them at international championships.

There, she won the gold medal on floor exercise,[1] defeating Romania's Cătălina Ponor, who would become the Olympic champion on the event the following year.

At the 2004 Summer Olympics in Athens, Dos Santos qualified for the floor exercise event final and became the first female gymnast to perform a laid-out double Arabian.

At the 2005 World Championships in Melbourne, Dos Santos tried to defend her floor title, but underrotated her first tumbling pass and fell, scoring an 8.837 and placing 7th.

In June, she won a gold medal on floor at a tri-meet competition in Natal, in which Brazil competed against Great Britain and Canada.

She qualified for the floor event final, but chose not to compete in order to avoid a worse injury that could keep her out of the 2007 World Championships in Stuttgart.

At the World Championships, Dos Santos was still not fully recovered, but she helped the Brazilian team place fifth and qualify for the 2008 Olympics in Beijing.

In June, she competed with the Brazilian team at friendly meets in Europe, where she performed the Dos Santos II for the first time since the 2004 Olympics.

In August, Dos Santos competed at her second Olympic Games, this time sharing the spotlight with newcomer Jade Barbosa, an all-around bronze medalist at the 2007 World Championships.

In January 2012, Dos Santos helped Brazil place 4th at the Olympic Test Event in London and won the bronze medal in the floor final, with a score of 14.066.