Steph Heresniak, who doubled twice, then walked. Breck Urban singled to move her over, setting the stage for Wall's walkoff hit.
Heresniak went 3 for 4 with four RBIs. Jarvis was 2 for 3 with two RBIs.
Danielle McKinn cracked a three-run homer for Lenape.
In other nonleague action:
Tricia Griffin went 2 for 3 with two runs scored to lead Cherokee to a 4-1 win at Winslow Township. Liani Ortiz hit an RBI triple for the Chiefs.
Rosie LaGrotta threw a five-inning perfect game in Sacred Heart's 16-0 win over visiting Bridgeton. She struck out nine. Danielle Lugo went 3 for 4, including a grand slam, and drove in seven runs.
Colonial Conference. Joanna Pizzo's RBI single in the eighth inning gave Haddon Township the lead for good in an 8-6 win at Audubon.
Maresa Malcolm homered and went 2 for 2 in Haddon Heights' 17-5 win at Collingswood. Catcher Mattie McCleery doubled twice and went 4 for 5. She needs two more hits to reach 100 for her career.
Kristen Kelbon scored six goals and Elise Sullivan added five as Bishop Eustace won at Camden Catholic, 19-7, in an Olympic Conference game.
Also in the Olympic, Shannon Nugent scored six goals, and Caroline Shinske chipped in with five to lead Shawnee to a 19-11 win at Lenape.
Burlington Liberty. Mackenzie Groark's three goals paced Delran to a 10-8 win over visiting New Egypt. Rachel Ceplo, Nicole Martin, and Leah Ross each scored twice.
Contact Tim McManus at firstname.lastname@example.org.