Lees was the first NZ female to win a quota and attend an Olympics.

She won her first Commonwealth Games medal in the 1994 Commonwealth Games, gaining a silver in the women's 10 metre air pistol (pairs) partnering Gerd Barkman.

[1] At the 1998 Commonwealth Games partnering Tania Corrigan she won two silver medals; one in the 10 metre air pistol (pairs) and one in the 25 metre pistol (pairs) event.

Four years later at the 2002 Commonwealth Games she won two bronze medals; one in the women's 25 metre pistol event, and another in the 25 metre pistol (pairs) event again alongside Tania Corrigan.

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