By Jason Mastrodonato, Globe correspondent

Coyle & Cassidy girls’ basketball senior Brenna Gonsalves has done just about everything coach Michael O’Brien has asked during her varsity career.

Gonsalves became the leading scorer in school history earlier this year, currently hovering around the 1,560-point mark, led the Warriors to a 18-2 regular season record, and most recently, made big plays when the season was on the line.

With her team up by one with just seconds remaining in the Division 3 South semifinals against Norwell Monday night, Gonsalves swatted a potential game-winning shot out of bounds. Moments later, a Norwell ball-carrier put up a last-second jumper that was again blocked by the Warriors’ scoring machine, and Coyle & Cassidy advanced to the tournament title game.

“She has carried us all year,” O’Brien said of Gonsalves, who ended the game with 7 points and 7 rebounds. “She got hurt in the first half, had her ankle taped up, came back in and played great.”

The Warriors have also benefited from two freshmen playing better than expected. Linsay Bumila is a 6-foot player with strong inside presence and Steph Skiba can knock shots down from beyond the arc.

“We’ve gotten some nice help from the younger kids,” said O’Brien.

Coyle & Cassidy will face Archbishop Williams for the championship on Saturday at UMass Boston. Archies has knocked O’Brien’s squad out of the postseason in three of the last four years.

“It’s kind of a friendly rivalry for the most part but we’re looking forward to it,” the coach said. “It’s going to be a great game.”