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Rousseff says US spying included "strategic factors or to do with commercial and economic factors."
The Brazilian Senate is probing reports that the NSA spied on Rousseff.
The Senate formed an Investigative Parliamentary Commission to investigate alleged US spying on Rousseff.
Brazil's justice minister said US spying on a Brazilian head of state went against ties between the two nations.
A spokesperson provided no details whether the two leaders would also meet privately.
A new reset is both possible and desirable in Washington-Moscow ties, writes a Russian foreign policy analyst.
The two sides stand divided on approaches to resolving the Syrian crisis.
It is understood that President Obama will still attend the G20 meeting in Saint Petersburg.
The US leader was set to meet Russian President Vladimir Putin ahead of the G20 Summit.
Forty-four per cent of Americans named China as the world's most powerful economy.
