She received NCAA All-America honours on nine occasions and was highly successful in the regional Big East Conference, taking fifteen individual championship victories for the Wildcats.

[2] Douma-Hussar made her international debut for Canada the following year at the 2001 IAAF World Cross Country Championships, placing 69th in the short race.

She had her best cross country finish at the 2004 World Championships, where her 17th place helped a Canadian team including Émilie Mondor, Malindi Elmore and Tina Connelly take the bronze medal in the short race.

She made it to the final and ran a Canadian indoor record time of 4:08.18 minutes to take the silver medal behind Kutre Dulecha.

Her form peaked at the 2004 Athens Olympics as she made it to the final and ran a personal record time of 4:02.31 minutes to take ninth place.

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.

[3] In her first major road outing, she won the women's title at the Fifth Avenue Mile in September ahead of Amy Rudolph.

[11] In the final short race to be held at the 2006 IAAF World Cross Country Championships, she managed 22nd place and the removal of the event from future programmes brought an end to Douma-Hussar's participation at the competition.

On the outdoor track circuit she had a season's best of 4:03.82 for the 1500 m at the Meeting Gaz de France in Paris and won the national title.

Despite this disappointment, she ran a lifetime best of 4:26.76 minutes for the mile two weeks later at the Memorial Van Damme in Belgium and came sixth at the 2007 IAAF World Athletics Final.