"I am happy to be at the Olympics," she whispered in Arabic, her brother, Hassan, holding both her arms. "Unfortunately, we did not win a medal, but in the future we will and I will be a star for women's participation."
Later, she sat on a sofa in her judo pants and a black Saudi Arabia track jacket and hijab, her father's arm around her shoulder.
"I was scared a lot, because of all the crowd," she said, giggling and animated as she answered questions from a small group of journalists, and vowed to be ready to compete again when the games move to Rio de Janeiro in 2016. "It was the opportunity of a lifetime."
Her father, Ali, a judo referee, told The Associated Press he "cried like a baby" watching his daughter compete.
"She was happy and smiled when she finished the fight. She hugged me and said: 'Daddy, I did this.' I was so proud," he said.
It didn't take long for voices of support to pour in — from the Olympic village and around the Middle East.
"Saudi judoka Wojdan Shahrkhani lost to her much more experienced competitor ... but many are proud of her," Saudi blogger and journalist Ahmed Al Omran tweeted.
Another Saudi resident, Alaa Al-Mizyen, added: "Wojdan remains a winner to me and millions of men AND women around the world."
Rafid Fatani, a Saudi-born man who has a blog called Saudi Root wrote, "I'll walk out later with the Saudi flag around my neck & my head up high as if we won the biggest gold medal in the history of the Olympics."
At the ExCel center, fans said they were thrilled to have witnessed history, even if the level of judo wasn't anything to write home about.
"I thought it was great, it's like a little piece of history that we saw this morning because it hasn't happened before," said Orla O'Connor, 33, from Cork in Ireland.
Mark Adams, a spokesman for the International Olympic Committee, hailed the participation of Shahrkhani and a female athlete from Qatar who competed in another event.
"It is a great symbol. It is a great message to women in those countries," he said. "Did we expect them to win gold medals? Probably not, but they're here, they're competing and I think we should be very happy."
Shahrkhani's opponent also had kind words, and said fears the hijab would get in the way, or even be dangerous, were overblown.
"There was no problem at all with the hijab. I think everyone has a right to their religion and to be given an opportunity," Mojica said. "This is no problem in judo."
In many ways, however, the young Saudi's story is just beginning.
Back home, some hard-liners have urged her not to jeopardize her place in the afterlife for a fleeting bit of fame on earth. Others have warned that she and her family could face ostracism when she goes home.
"She will definitely face difficulties (back home)," Hashem Abdo Hashem, editor-in-chief of Saudi's Arabic daily newspaper Okaz, told The Associated Press. "The society here will look at her negatively."