Ava Prosdocimo scored three times and Steinert rang up five first-half goals en route to a 6-0 rout of West Windsor-Plainsboro North in Hamilton.
Irene Jackman, Abby Navarro and Samantha Gray contributed goals for the Spartans, who improved to 8-6.
Jasmine Bard had a pair of assists for Steinert. Mia Petracca and Bella Rosa split time in the net and made two saves each.
West Windsor North fell to 5-6.
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