AUBURN — Freshman Charlotte Gastonguay scored six goals and assisted on three others to lead St. Dominic Academy to a 15-2 win Tuesday over Erskine Academy in a Class C girls’ lacrosse semifinal.

Gastonguay’s sister, Caroline, and Avery Lutrzykowski each added two goals and two assists, and Emma Theriault and Mia-Angelina Leslie also scored twice for second-seeded St. Dom’s (11-3), which will play No. 1 Lake Region for the state championship Friday at Portland’s Fitzpatrick Stadium.

“The past three games, we were off to a slow start,” St. Dom’s Coach Leslie Klenk said. “We weren’t being patient and were caught off guard. Our focus today was to get off to a smart, fast start and keep going from there.”

The Saints were off and running when Charlotte Gastonguay scored off the opening faceoff 10 seconds into the game, off a feed from Lutrzykowski. Theriault made it 2-0 before the 30-second mark.

“We were coming out expecting different results, and when you come down and get two quick ones, our kids work hard and they aren’t going to quit, but it’s very hard to comeback from repeated shots on goal,” Erskine Coach Shara Macdonald said. “Our goalie played well today. I thought she had some really nice stops.”

Ashlyn Wing made seven saves for sixth-seeded Erskine (9-5).

Theriault hit the post a few times in the fist half, but Lutrzykowski scored twice in less than three minutes to give the Saints a 5-0 lead.

Caroline Gastonguay picked up her first goal off an assist from Lutrzykowski, and Leslie made it 7-0. Charlotte Gastonguay then took over as the Saints pushed their lead to 11-0 at halftime.

While she wasn’t tested often, Saints goalie Simone Long was solid in goal in the opening half, stopping all four shots she faced. She made six saves in the second half.

Leslie opened the second half with her second goal, before Charlotte Gastonguay and Theriault stretched the lead to 14-0.

Jordan Linscott broke up the shutout with 7:30 remaining. Isabella Johnson scored the Eagles’ second goal four minutes later.

“We really didn’t set up our offense until the second half,” Macdonald said. “If you aren’t running something and you are just standing, it makes it difficult to score.”

Taryn Cloutier capped the scoring for the Saints.