For the past two years, Nia Dorsey was a regular in the stands at Good Counsel girls’ soccer games, watching closely and counting down the days until she’d be able to join her big sister Imani in the Falcons’ lineup.

Finally a freshman at the Olney private school, Dorsey made her first varsity start in Thursday’s game at O’Connell, filling the spot left by All-Met Player of the Year Midge Purce, who will spend the next month representing the United States in the U-17 Women’s World Cup in Azerbaijan.

The young forward rose to the moment, scoring her first varsity goal as top-ranked Good Counsel beat the third-ranked Knights, 3-1, in a Washington Catholic Athletic Conference matchup in Arlington.

“I’ve looked up to [Imani] — how she played with her teammates,” said Nia Dorsey, who chose to play at Good Counsel over Howard, her neighborhood school. “Their playing style and their chemistry was always so amazing to me. I was so excited to get to join them.”

The Dorsey sisters said they hadn’t played on a team together since Nia’s first season of youth soccer, but with Purce several time zones away, they provided the offensive spark Good Counsel (4-0, 2-0 WCAC) needed against O’Connell (4-1-1, 1-1).

Imani Dorsey, an All-Met who has orally committed to Duke, started the scoring in the 32nd minute with her fourth goal of the season. She controlled a long ball into the box from junior Karli Cirovski and ripped in a shot from 10 yards out.

Five minutes later, her younger sister followed suit. Nia Dorsey ran on to a pass from fellow freshman Nicole Bautista and slotted a low shot past the charging goalkeeper.

“I’ve seen this whole new side to her,” Imani Dorsey said. “I always think of her as my little sister, but she can hold her own, and it’s great to see her out there like that.”

Good Counsel, which also got a late goal Thursday from senior Jordyn Brock, added four freshmen to its varsity squad this season headlined by Dorsey — who Coach Jim Bruno called “a pure striker.” The Falcons returned all 11 starters off last season’s squad and are ranked No. 1 in the NSCAA national poll, but Dorsey said the group has made it easy for her and the other newcomers to find their roles.

“The team was already great before,” Nia Dorsey said, “but I think we can bring some variety — step it up a little bit for them.”

Senior Morgan Reuther scored for O’Connell in the 62nd minute off a pass from sophomore Stephanie Page. The Virginia recruit has 13 goals in six games.