Birchard and her team began the 2017–18 season by winning the 2017 Colonial Square Ladies Classic, after beating defending Olympic champion Jennifer Jones in the final. She played vice for Jones on Team Manitoba at the 2018 Scotties Tournament of Hearts, with Jones' regular vice Kaitlyn Lawes absent in preparation for the mixed doubles tournament of the 2018 Winter Olympics. They would go on to win the Scotties after defeating fellow Manitoban, Kerri Einarson in the final. After the win Birchard said that "It's pretty unbelievable. I don't even have words right now, I'm speechless. I'm so overjoyed and so happy that they chose me to come along. This has been a dream of mine for a really long time." With Lawes returning to the team following the Olympics, Birchard became the alternate for Team Canada at the 2018 World Women's Curling Championship. In their matches against the Czech and Italian teams, Birchard had a chance to play in the second half, replacing Lawes and Jill Officer in each of their games well under control. She had a chance to play a full game, replacing Officer in their match against Japan. The team went undefeated through the whole tournament, winning the extra-end final against the reigning Olympic champions, Team Hasselborg of Sweden.