Schwab was stabbed in the left side and rushed to Jacobi Medical Center where she died.
New Rochelle High School officials said in a statement they are cooperating with police in the case, and are making counselors, social workers and other professionals available for students and staff.
Police say 16-year-old Z'inah Brown, of Yonkers, turned herself in Thursday afternoon.
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Investigators provided a flyer showing Z'Inah Brown, who they say fatally stabbed a teen girl at a New Rochelle Dunkin' Donuts on January 11, 2017.
At 1 p.m. Thursday, she surrendered to authorities and booked for second-degree murder, police said. She said nothing at her arraignment Thursday evening and is due back in court January 17.
Schwab was taken to a hospital where she died.
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Also not clear is how Brown came to be carrying a steak knife along with her victim, being in possession of pepper spray. Police said she and a teenage boy got into a fight with at least six other teenagers in the Dunkin Donuts at 646 North Avenue, across from Iona College.
"Our hearts go out to all who have been touched by this tragic occurrence", said a statement from the New Rochelle school district.
Grief counselors will be at the school Thursday. They are believed to all be students at nearby New Rochelle High School, which is about a half mile away. 'This is a devastating loss for our school community, and our deepest condolences go out to Valaree's family and friends'. "Thank you to those who brought the matter to our attention", the school stated online.
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