Prosecutors say 17-year-old Z'Inah Brown stabbed 16-year-old Valeree Schwab twice during an argument outside a Dunkin' Donuts near New Rochelle High School on January 10.
Dominique Slack, 17, Carl Booker, 17, and a 15-year-old are also charged in connection with the killing.
Brown faces second-degree murder, first-degree manslaughter, criminal possession of a weapon, gang assault and stalking charges.
Slack and Booker face gang assault and stalking charges.
They're all due back in court on April 17.
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