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The rally on Saturday was attended by thousands of people and attracted several U.S. politicians, including former NY mayor Rudy Giuliani, who is now President Donald Trump's personal lawyer.
She said all sides would continue to look at ways to maintain the deal despite the re-imposition of U.S. sanctions.
Foreign ministers and senior diplomats from Britain, China, France, Germany and Russian Federation held talks on July 6 with their Iranian counterpart, Mohammad Javad Zarif, in Vienna for the first time since U.S. President Donald Trump announced he was abandoning the nuclear deal and moving to reimpose sanctions on Iran.
Trump announced on May 8 that Washington was walking away from the nuclear agreement, which was reached between Iran and the five permanent members of the UN Security Council - the United States, Britain, France, Russia and China - Germany, and the European Union in 2015.
In 2012, Iran threatened to block the strait in response to sanctions by the United States and the European Union against the country's nuclear program. Washington has since told countries they must stop buying the OPEC producer's oil from November 4 or face financial consequences.
Speaking on French radio ahead of arriving in the Austrian capital, France's foreign minister said world powers would struggle to put together an economic package immediately.
US-Iran relations have been hostile since the 1979 overthrow of the US-backed shah and the US embassy hostage crisis. "We are trying to do it (economic package) before sanctions are imposed at the start of August and then the next set of sanctions in November".
Speaking also on July 6, German Foreign Minister Heiko Maas said world powers would not be able to fully compensate for companies leaving Iran due to new US sanctions. He stressed hat world powers would struggle to compensate Tehran for companies leaving Iran.
Austria's Chancellor Sebastian Kurz (r) and Iranian President Hassan Rouhani give a joint press conference following a meeting on July 4, 2018 at the Chancellery in Vienna.
"It would be meaningless that Iran cannot export its oil while others in the region can".
Rouhani told Merkel the US exit from the JCPOA has caused some problems in economic areas, banking transactions and oil sector for the foreign companies which have made investment in Iran, making them reluctant about continuing their operations in the country.
"To save the deal, other signatories should compensate for U.S. sanctions", a senior Iranian official told Reuters on Friday. Iran's navy chief said it would be "easy" to block the strait, while its vice president warned that not a "drop" of oil would pass through it if more sanctions were piled onto Iran.
The U.S. Navy stands ready to ensure freedom of navigation and free flow of commerce, a spokesman for the U.S. military's Central Command said on Thursday, after Iran warned it will block oil shipments through the Strait of Hormuz.