Mackensie made her senior international debut for Denmark in August 1983, playing in a 2–1 friendly defeat by Sweden in Mellerud.
[1] At the 1991 FIFA Women's World Cup in China, Mackensie played the full 80 minutes in all three group games as Denmark qualified for the quarter final, scoring in the 3–0 win over New Zealand.
[2] In the quarter final against Germany, Mackensie scored a penalty kick to equalise Bettina Wiegmann's opening goal and force extra time.
She scored twice in her final match for Denmark, a 3–1 win over Germany in the third place play–off at UEFA Women's Euro 1993.
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