Both of Thompson’s goals came in the second half, the first assisted by Brittany Rooker and the scond by Kalli Vogel.
As Ally Palazzone manned the back line, Shannon DeSantis protected the net with eight saves.
Region 5AAAAAA runner-up Lassiter (13-3-1) will host North Gwinnett in next Tuesday’s second round. The Lady Bulldogs are a No. 4 seed who upset Lambert in their first-round game.
Walton 3, Dacula 0: Three players scored as the Lady Raiders eased to a first-round win in the Class AAAAAA state playoffs.
Leigh Purinton, Mandi Goodman and Erin Ratchick scored, with Purinton, Erica Langhorne and Mary Leigh Amerin adding assists.
Michel Fernandez recorded the shutout, saving seven shots.
Region 5AAAAAA champion Walton (13-3-2) will host South Forsyth in the second round.
Hillgrove 3, Camden County 0: Necee Jennings scored on a free kick from 25 yards out to get the Lady Hawks on the board, and they rolled into the second round of the Class AAAAAA playoffs.
Hillgrove (15-4-1) will travel to Newnan in Tuesday’s second-round game.
Jennings’ goal was the only one scored in the first half, but Rachel Palazzo made it 2-0 off a corner kick by Sydney Nelson.
Maggie Gaughan closed the scoring with a goal off a volley from Emma Dawson.
Ivy MacIntyre and Breanne Dykes combined to make five saves.
Walker 3, Brookstone 1: The Wolverines moved one win away from clinching a spot in Jonesboro for the state semifinals.
Walker (17-3-1) advanced in the private-school Class A playoffs, bolstered by a doubles sweep. Will Chocallo and Daniel Sosnovsky won 6-2, 6-1 at No. 1, while Austin Newsome and Sloan Coolbroth won 6-2, 6-0 at No. 2.
Derrick Brown also prevailed, winning 6-0, 6-4 at No. 1 singles.
Area 4A champion Walker will face either Athens Academy or Savannah Country Day in the semfinal-round match, which must be played by May 8.
Kennesaw Mountain 5, Newnan 0: The Lady Mustangs had no problem winning the second-round match of the Class AAAAAA state tournament.
Samantha Armas and Nicole Croxton each recorded shutouts in singles play, while Chika Okonkwo only allowed two games.
The doubles team didn’t fare much worse. Marilyn Corn and Katie Manrowe allowed three games at No. 1, and Samantha Maddin and Ivy Evatt allowed two at the No. 2.
Kennesaw Mountain (20-3) will host Lowndes in Thursday’s quarterfinal.
Allatoona 3, Sequoyah 0: The Lady Buccaneers rolled into the Class AAAAA state quarterfinals with a dominating performance.
Kennedy Craig won her No. 1 singles match 6-1,
6-0. Allison Whitley followed at No. 2, winning 7-5, 6-4 and the doubles team of Melanie Whitley and Kristi Cooper closed out the match with a 6-0, 6-2 victory.
Allatoona (19-1-1) will host Northview in the next round, which must be played by Saturday.
Whitefield 11, Pace Academy 10: Preston Blair scored four goals to lead the Wolfpack to a non-area victory.
Dallas Darling had three goals and three assists, while and Matt Milburn made 10 saves in goal.
The game was part of an unofficial four-team Class A playoff. Whitefield (14-3) will play Holy Innocents’ on Friday at Pace Academy for the unofficial championship.
Harrison 12, Allatoona 7: Luke Wittenberg had four goals and two assists to lead the Hoyas to a non-area victory.
Zach Danneman finished with three goals and two assists. Alex Mowry and Seth Cowan each had two goals and an assist and Damon Cowan added a goal.
Harrison (8-7) will travel to Milton on Thursday for its final regular-season game.
Kell 26, Creekview 6: Alex Llerandi scored six goals, Devin Llerandi scored five and the Longhorns rolled to an Area 2A-AAAAA victory.
Alex Jaramillo scored four goals, while Damien Prosser, Riki Kujanpaa and Zach Kauwenberg each added three apiece.
Kell will host Riverwood on Friday in the final game of the regular season.
Walton 16, Woodstock 4: The Lady Raiders won their penultimate Area 2AAAAAA game and remained in position for a home playoff game.
Walton (14-1-2, 6-1) will travel to Roswell on Friday, with a win and a Lassiter loss to Milton guaranteeing the Lady Raiders the No. 2 seed. Should Walton and Lassiter both win their games, it would create a three-way tie for first.
Erin McBride led Walton with five goals and an assist, while Annie Poling had three goals. Meghan Butler, Maddie Weiss and Kylie Holthaus each had two goals, with Butler contributing an assist.
Emily James and Kathryn Sweeden combined for five saves in the net.
Kennesaw Mountain 21, East Coweta 0: Jessica Snyder scored three goals with an assist to lead the Lady Mustangs to an Area 1AAAAAA victory.
The win secured the area’s No. 2 seed, which means Kennesaw Mountain will open the Class AAAAAA playoffs at home next week.
Kim Sortino scored two goals and Caroline Dyar added a goal with two assists.
The Lady Mustangs (13-4, 6-1) will travel to Lovett on Friday to close the regular season.
Westminster 12, Kell 11 (OT): The Lady Longhorns rallied from a four-goal halftime deficit to take a 9-all tie into overtime, but they couldn’t hold on for the win in the Area 2A-AAAAA game.
It was the first area loss for Kell (12-5, 6-1), which played with a two-player disadvantage for the final 8½ minutes of regulation and through both of the 6-minute overtime periods.
Sarah Bialecki and Leslie Ferguson each had three goals, while Ferguson added two assists. Emily Swift had two goals and three assists.
Kell will host area rival Riverwood in Thursday’s regular-season finale.