With the eyes of the world upon her, she knew she had to be flawless.
Pence also reiterated the White House position that North Korea needs to denuclearize before any progress in relations between the countries can be made. She and Kim Yong Nam were seated behind Moon and his wife, while Pence and his wife were seated beside the Moons and Japanese Prime Minister Shinzo Abe.
Since arriving in Seoul on Thursday, Pence has been delivering a strong message against the Kim regime and waging a campaign to stop Pyongyang from "hijacking" the Olympics with its charm offensive.
The "Kim" impersonator told Reuters he and lookalike "Trump" were "getting along great". But rather than presenting herself as a stiff party operative, she has looked engaged and interested during multiple outings in Seoul, Pyeongchang and Gangneung.
Moon can only visit North Korea on one condition - that Kim agrees once and for all to give up his nuclear weapons. But she has generally remained safely cloaked in her brother's shadow.
And Pence's personal guest at the games will be Fred Warmbier, the father of Otto Warmbier, an American who died a year ago days after his release from captivity in North Korea.
It was already known that Kim Yo Jong is an adviser to her brother; now many are interpreting her presence here - and the freedom with which she seems to behave - as new signs of the power she holds. But Pence was also warning Seoul not to be fooled by refusing to attend a banquet at the Winter Olympics where he could have met with the high-level North Korean delegation.
Despite President Moon's efforts to encourage diplomacy, the childish anti-diplomatic behavior of Vice President Pence undermined an opportunity for peace diplomacy at the opening of the Olympic Games, writes Kevin Zeese.
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It was the US that appeared to be the one left in the cold, especially after the sister of the North Korean dictator extended an invitation from her brother for Moon to visit the North.
But Pence said that Moon told him "a bit" about his meeting with the North Koreans, and that he "appreciated him sharing his perspective on that".
Some South Korean media had criticized Pence's decision to attend the opening reception for only five minutes, instead of sitting at the same table as the North Koreans, and not to stand when the joint Korean team entered the stadium on opening night.
During his meeting with Kim Jong Un's sister Kim Yo Jong on Friday, who visited the South as a special envoy for the North Korean leader, Moon said North Korea should play a more active role in opening up direct talks with the US.
The Koreans proved no match for a Swiss team ranked sixth in the world by the International Ice Hockey Federation and winners of a bronze medal four years ago in Sochi, Russia.
Kim Yo Jong, 30, is the first member of North Korea's ruling family to visit the South since the end of the 1950-53 Korean War.
The country has had a history of taking provocative acts and agreeing to talks that lead nowhere.
Rogin said that the proposed course of diplomacy signifies that the USA and its allies will not stop imposing pressure on Pyongyang until it takes clear steps toward denuclearization but the Trump administration is willing to sit down and talk with the regime while that pressure campaign is ongoing. It's anyone's guess as to when we might learn what's behind the facade.