Her absence meant rookie backup Shannon Meyer was forced into net. And she was tested early - within the first minute, she was forced to turn away a Garneau breakaway.
TRU also had an early break-away chance, but Stacy Bekkering was stopped by Elans keeper Anne-Catherine Huot.
Schweizer said it took the nervous WolfPack a good 20 minutes to settle in. F-X Garneau controlled the play during that time but couldn't score.
Kelsi Butner was TRU's player of the game, while Marie-Josee Marcotte earned that honour for F-X Garneau.
The victory was especially gratifying, Schweizer said, because the WolfPack - or its predecessor, the UCC Sun Demons - has lost in three previous meetings with F-X Garneau in the last four years.
Twice, the Sun Demons lost in the national final, 2-1 in overtime and 3-0. Last season, Garneau beat the WolfPack 2-0 when the teams met in the round-robin.
Meanwhile, the top-seeded Langara Falcons took the first step toward defending their national women's crown by trouncing the sixth-seeded Nova Scotia Agricultural College Rams 9-0 in their round-robin opener.
Player of the game Diana Cochrane led the Falcons with three goals.
Today, NSAC and the No. 4 Durham Lords square off. In men's nationals action on Wednesday, All-Canadian Corey Birza scored twice to lead the top-seeded Capilano Blues to a 4-2 victory over the No. 6 Mt. St. Vincent Rams.
In the other pool, Will Beague scored twice as the No. 2 Algonquin College Thunder blanked No. 5 Langara 4-0.