This, coupled with the gold she had already won in the super-G in alpine skiing made her the first female to win gold in two different sports at the winter Olympic Games and just the fifth athlete overall to do so.
She outraced Selina Joerg of Germany to the line in the final and won by.46 seconds, a much more comfortable margin than the.01-second edge in the super-G race that left her staring at the clock in shock, wondering if someone had made a mistake.
On Saturday at Phoenix Snow Park, the 22-year-old was indeed the best "snowboard girl", capturing gold in the snowboard parallel giant slalom, finishing almost two seconds better than any other competitor in the qualifiers before winning all four knockout rounds by 0.40 seconds or greater.
"It was quite tough to change myself back into a snowboarder", said Ledecka after her triumph. "I enjoyed every run, and I'm very happy to be here and stand on the highest place".
With Saturday's win, Ledecka joins Thorleif Haug and Johan Groettumsbraten as the only athletes to achieve a multi-sport double at the Winter Games.
While her win in the super-G caused jaws to drop and will be remembered as one of the great moments in Olympic history, beating the likes of ski royalty Lindsey Vonn in the process, victory on the penultimate day of the Games was expected. "From the start there were a lot of people who would say, "it's not possible to get to the top in both, '" she admitted". Although, according to her coach Justin Reiter, this shouldn't have happened.
"This is the best thing about my job, the racing". "My plan is to stay with my heart, so for now I think I will do both because I love both", she said.
The Czech, dubbed a "miracle on snow", then blew away Austrian Daniela Ulbing, who had narrowly avoided running over a squirrel in winning her first race.
Among those skeptics was Reiter, a US Olympic snowboarder himself in Sochi four years ago.
"But because of who Ester is, and how she functions, that is not enough".
"Even underneath the suit, I get goosebumps talking about it", Leif Kristian Nestvold-Haugen of Norway said.
"It was a great feeling", she admitted. "If they want to do more, do more and try the best". This year she focused on her health and now has two gold medals to show for it. "I definitely think she'll have a long-lasting impact".
Ledecka revealed that it felt odd to go back-and-forth between the snowboard and skis.
"It is great honour to be the first Korean medallist in snowboarding", Lee said.
"Today was a big day for snowboard Ester!". She had not worn makeup, preferring to keep her eyes shielded from the roomful of reporters and cameras.