Emery Mizell died following the fight outside the entrance 1105 Boynton Ave., where the suspect lives, on Thursday evening.
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The younger girl is accused of stabbing Mizell in the chest, killing her.
As many as 10 teens were present. Two other teens, a boy and a girl, were interviewed as witnesses and released.
The attack was captured on building surveillance video, which detectives are reviewing.
Detectives are looking into whether Mizell was the target of ongoing harassment by her peers.
Mizell was killed just after leaving Metropolitan Soundview High School, where grief counselors were brought in Friday. The school is two blocks away from where she was killed.
Schools Chancellor David Banks was notified of the death. An official said he is concerned with both crimes occurring in the immediate vicinity of schools, as well as crimes driven by social media.
Mizell was set to graduate high school next month.
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The younger girl, who was not identified because of her age, was charged with murder.
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