Maria Del Carmen Huber Guevara, 63, travelled in a bus with 60 other people all night just to get the chance to see Mexican President Claudia Sheinbaum in person during a rally Sunday in Mexico City.

Huber Guevara said she left her home in Boca del Rio, in the state of Veracruz, at 11 p.m. local time for the 400-kilometre trip northwest to the national capital where she arrived at 6 a.m.

"[She] is the best because she is the first female president and, the truth is, she is working well for us," said Huber Guevara, sitting on a chair in Constitution Square, which was jammed with tens of thousands of Sheinbaum supporters waiting to hear the president speak from a large white stage to mark her first year in office.

The crowds spilled into the adjacent streets beneath the white flags of Sheinbaum's party, the left-populist National Regeneration Movement, known as Morena, which fluttered among blimp-like white balloons.

Huber Guevara said that Sheinbaum's government had finally given her title to her home where she's lived for over 30 years as part of a neighbourhood that grew on squatted land.

"Imagine living in a place for 30 years with nothing to show that you are the owners," she said. "How can you not be grateful?"

Maria Del Carmen Huber Guevara travelled over 400 kilometres from her home by bus to see Sheinbaum at the rally on Sunday.