And just like that, the first quarter was over.
The Magic needed their star only to get them started in Wednesday's 42-30 win over St. Basil in the Catholic Academies championship game.
Then they did the rest themselves.
"It is the biggest game of the year for us," Louin said of her squad's second straight title. "It is our No. 1 priority, so to bring it home feels great."
Louin's 13-point first quarter ignited Mount (22-2), ranked fifth in Southeastern Pennsylvania by The Inquirer, and Libby Tacka, Mary Kate Ulasewicz, and Carly Monzo got involved on the offensive end as the contest progressed.
"A lot of times this year, we rode Alex's shoulders, but as the game progressed, some of our other players had to step up, and they did," Magic coach John Miller said.
Louin finished with a game-high 18 points. Tacka added 13, Ulasewicz scored six, and Monzo put in the Magic's remaining five points.
Karen Lapiewicz led St. Basil with 13.
Despite having lost to the Mount twice already this season - including a 24-point defeat a few weeks ago - St. Basil (19-5) stuck around all game in a spirited effort, staying within single digits almost the entire way.
But when the Panthers needed a bucket most, the Magic defense came alive, surrendering only three three-pointers to sharpshooting Basil.
"We knew that if we could bring it defensively that we were going to win this game tonight," Louin said.
As Louin and her fellow seniors took the trophy back to their teammates, they were understandably mobbed. It was only fitting.
What started with a flurry ended with one, too.
St. Basil 13 4 9 4 – 30
Mount St. Joseph 18 8 7 9 – 42
SB: Karen Lapiewicz 13, Kate Skalski 7, Holly Forst 5, Molly Greenberg 2, Kelly Mancini 2, Kalee Fuegel 1.
MSJ: Alex Louin 18, Libby Tacka 13, Mary Kate Ulasewicz 6, Carly Monzo 5.
See and hear from Mount St. Joseph senior forward Carly Monzo. www.inquirer.com/rallypa