LAPD officials said Herscu turned herself in with an attorney when her family encouraged her to surrender after seeing reports on TV.
Investigators believe Herschu was behind the wheel of a car that crashed into 18-year-old Nysmuh Imann Taylor early Sunday.
Taylor was crossing Moorpark Street near Matilija Avenue when she was hit and died at the scene.
Investigators allege Herscu made a U-turn after the crash, looked at the body and fled.
She is being held on $50,000 bail.
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The mother of the victim said she is relieved the suspect is in custody, but it will not bring her daughter back.