Walsh, also a senior, reached the milestone on the game's first possession. She became the first Shipley girls' player to hit 200 threes.
Inter-Ac. Caitlin Clark shot 11 for 14 from the foul line, and her 15 points guided Notre Dame past host Penn Charter, 54-49. Alex Kane added five rebounds.
First-year team New Foundations needed to win its final nine games of the season to secure a spot in next week's Public League Division E playoffs.
And the ninth win came down to the final seconds.
Travon Williams hit four free throws in the final minute to seal New Foundations' playoff hopes with a 55-50 win.
Also in the Public League, Constitution finished on a 13-0 run to rally past host Philadelphia Electrical, 60-49. The Generals trailed by a point with 5 minutes, 8 seconds left. Ahmad Gilbert scored eight points in the third quarter.
Del-Val. Jeff Padilioni scored 15 points and grabbed 10 rebounds as Penn Wood cruised past visiting Academy Park, 72-48. Addison Scott had five assists.
Monteverde Invitational. Math, Civics and Sciences slipped past Ocala Vanguard (Fla.), 56-55, in Orlando, and the Mighty Elephants will be rewarded with a date Friday night against the nation's No. 1 team.
Samir Doughty scored 16 points, and Donovan Barnes had five assists.
MC&S will play host Montverde Academy at 8 p.m. Friday.
Bishop McDevitt clinched its second District 12 Class AA title in the last three years with wins over Palumbo and Archbishop Carroll.
Joshua Velez-Arce earned pins in both of his bouts. The Lancers downed Palumbo, 66-17, and Carroll, 66-7.