While in juniors, Birnie made four appearances at the
Canadian Junior Curling Championships in
1998,
1999,
2000 and
2001, all as second for
Nicole Baldwin. In their first two appearances, the team posted their best records, finishing 6–6 in both 1998 and 1999. Their worst performance came in 2000 where they went 3–9, finishing in twelfth place. Their final showing in 2001 saw them finish in ninth with a 5–7 record. Birnie's next curling success wouldn't come until 2019 when she won the
Yukon Scotties Tournament of Hearts. Her team, with skip Nicole Baldwin, second
Ladene Shaw and lead
Helen Strong represented the Yukon at the
2019 Scotties Tournament of Hearts in
Sydney,
Nova Scotia. There, they finished with a 1–6 record, beating the Northwest Territories'
Kerry Galusha rink 13–6 in Draw 14. The following season, Birnie returned to the Scotties, skipping her own team of
Chelsea Duncan,
Gabrielle Plonka,
Kimberly Tuor and
Rhonda Horte. Through their seven games, the team finished with a winless 0–7 record. After not competing in 2021, Birnie won the Yukon Scotties championship in 2022, defeating the defending champions Team
Laura Eby 2–0 in the best-of-three qualifier series. The team finished 0–8 at the
2022 Scotties Tournament of Hearts in
Thunder Bay,
Ontario. Team Birnie competed in one tour event during the
2022–23 season, the
King Cash Spiel in
Maple Ridge,
British Columbia. Through the round robin, the team finished with a 3–1 record, qualifying for the playoffs. They then lost to British Columbia's
Shawna Jensen in the semifinal. At the
2023 Scotties Tournament of Hearts, Birnie led the Yukon to a 1–7 round robin record. In their sole win, the team upset Wild Card #2's
Casey Scheidegger 10–3. ==Acting==