Katherine Ratz got the ball on the right side of the field and crossed it into the box. A Guerin defender tried to clear it away, but it didn't get all the way out and found the foot of Rachael Bellefuil.
The Eagle sophomore placed a left-footed shot perfectly far post for the 1-0 lead.
"She was in the right place in the right time," Aguillon said. "It was a great finish. She has been playing great for us all season. That is what it is going to take, we need to have all the girls step up and have big games in tough games like this."
A little more than four minutes later, Ashlyn McElderry drew a foul about 25 yards from goal.
Pooh Lewis stepped up and blasted a low shot into the goal for a 2-0 lead.
Aguillon said Katy Keen normally takes the free kicks in the scoring areas, but they liked the way Lewis had been taking them in practice.
"We practiced it yesterday and Pooh was taking them from there and was hitting them really well," Aguillon said. "So we told her that if we were close in that range, where maybe Katy's shot would go over the goal more, to take it because she could keep it lower. That is exactly what she did."
The Eagles defense held strong for most of the second half, preventing Guerin from getting back in the game.
Guerin managed to score with 2:45 remaining in the game, however, and made the last 165 seconds a little nerve-racking for the Zionsville faithful.
But the Eagles had no problems closing out the final minutes.
"We talked at halftime about how they were going to come out strong in the second half," Aguillon said. " We knew those first 15 minutes were going to be key. We made sure the girls knew to pay even more attention defensively. We held them for most of the half, then they score with like three minutes left then the clock couldn't run fast enough. To me every second seemed like an hour. But our girls never stopped, they believed in themselves and played an excellent game. That is two tough ones in a row and now we have to get ready for Westfield and that is not going to be easy."