She began 2005 by breaking her second national record: her winning run of 4:28.43 minutes in New York was a Canadian indoor record for the mile. She also won the mile at the Millrose Games. Douma-Hussar was Canada's best performer at the 2005 IAAF World Cross Country Championships, coming 25th in the short race. She won the 1500 m outdoor national title and went on to take ninth place at the 2005 World Championships in Athletics. Two weeks after the final she ran a life-time best of 4:02.29 minutes at the Rieti Meeting. At the 2006 IAAF World Athletics Final she ran in both the 1500 m and the 3000 meters, coming fourth in the former event and setting a best of 8:53.83 minutes in the latter. In her first major road outing, she won the women's title at the Fifth Avenue Mile in September ahead of Amy Rudolph.