[2] Einarson is a four-time women's national champion in curling, skipping her team to victory in the 2020, 2021, 2022 and 2023 Scotties Tournament of Hearts.
Einarson scored a rare eight-ender in her first round robin game of the 2015 Manitoba Scotties Tournament of Hearts against Tiffany McLean.
That year Einarson would also win her first provincial championship, qualifying her team of Selena Kaatz, Liz Fyfe and Kristin MacCuish to represent Manitoba at the 2016 Scotties Tournament of Hearts.
While she didn't win any more events that season, she made it to the finals in two Grand Slams, losing to Jennifer Jones at the 2017 Masters of Curling and to Rachel Homan at the 2018 Humpty's Champions Cup.
However, her team amassed enough tour points over the season to play in the first ever Scotties Tournament of Hearts wildcard game against the higher ranked Chelsea Carey rink.
For the 2018–19 season, Einarson would form a new team of Val Sweeting, Shannon Birchard and Briane Meilleur, all former skips.
[5] They began the season by winning four straight World Curling Tour events in three weeks: the 2018 Stu Sells Oakville Tankard, the inaugural Morris SunSpiel, and the Mother Club Fall Curling Classic,[6] and in October they won the Curlers Corner Autumn Gold Classic.
Their strong play during the early part of the season earned them enough points to put Einarson in the Wild Card game once again at the 2019 Scotties Tournament of Hearts.
The team would rebound to have a strong finish at the end of the season, winning the 2019 Players' Championship and losing in the final of the 2019 Champions Cup.
[7] For her strong play through the week of the Scotties she was named the MVP of the tournament and was awarded the second team all-star as skip.
[8] The team was set to represent Canada at the 2020 World Women's Curling Championship before the event got cancelled due to the COVID-19 pandemic.
[13] Einarson was named to the First Team All-Stars for the tournament, alongside teammates Shannon Birchard and Val Sweeting.
[14] A month later, and Einarson was back in the Calgary bubble to team up with Brad Gushue at the 2021 Canadian Mixed Doubles Curling Championship.
After finishing pool play with a 5–1 record, the pair won five of six of their playoff matches, including the championship game against Kadriana Sahaidak and Colton Lott.
[15] Einarson returned to the bubble for a third time in April 2021, along with her women's team to play in the two only Grand Slam events of the abbreviated season.
Through the round robin, the defending Scotties champions posted a perfect 8–0 record, earning a spot in the playoffs.
They then lost in the seeding round to New Brunswick's Andrea Crawford, meaning they would have to win three straight games to defend their championship title.
[32] Team Einarson was chosen to represent Canada at the 2022 Pan Continental Curling Championships where they qualified for the playoffs as the second seeds with a 7–1 record.
[35] In December, they travelled to Japan to compete in the 2022 Karuizawa International Curling Championships where they lost in the final to Kim Eun-jung.
[38] They then won both the 3 vs. 4 game and the semifinal over Nova Scotia and Northern Ontario respectively to reach another national final where they again faced Jones.
[44] Team Einarson reached the quarterfinals in their first event of the 2023–24 season, falling to Serena Gray-Withers at the 2023 Saville Shootout.
They had three semifinal finishes and one quarterfinal appearance before missing the playoffs at the 2024 Players' Championship, breaking their streak of qualifying at the previous twelve Slams.
Once there, however, they lost both their games to Team Homan and Manitoba's Kate Cameron, eliminating them from contention and ending their chance of a record setting fifth straight Scotties title.
[48] Following the event, in March, it was revealed that Harris had been provisionally suspended for up to four years for testing positive for Ligandrol, a banned substance.
[2] Einarson's brother Kyle Flett was also a competitive curler, reaching the Manitoba junior men's provincial final against Daley Peters in 2005.