Clinton campaign organizers in Arizona on Tuesday shared a photo of the centenarian as she headed to her polling place to cast her vote.
"When Jerry was born, women didn't have the right to vote," the tweet said. "Today ... she voted for the first woman president."
Emmett told KPHO that casting her ballot for Clinton was "the greatest thrill" of her life.
"I just wish my mother and dad could see all of this," she said.
Emmett was born in 1914, six years before the ratification of the 19th Amendment to the Constitution gave women the right to vote.
She told KPHO she was a teenager when she watched as her mother cast her very first ballot.
"They all came down to watch the women get to vote," Emmett told the news station. "Even the men were happy, and they were all cheering and we kids were running around there. We knew something good was happening, you know."