The Metropolitan Police said officers were called at 8.13am on Thursday after a collision involving a pedestrian and a car on North Road, Highgate, north London.
Police said the girl died at the scene.
In a tribute released through the force, the teenager’s family said: “Melissa was a light in our lives and an amazing person.
“We will miss her deeply, every single day. Her kindness, warmth, and beautiful spirit will always remain in our hearts.”
A spokesperson from Highgate School said Melissa was in Year 12 and on her way to school when the collision took place.
The driver of the Addison Lee car, a 68-year-old man, was arrested at the scene on suspicion of causing death by careless driving. He has since been released on bail.
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Detective Inspector Simon Ager, who is leading the investigation, said: “Our thoughts remain with Melissa’s family following her tragic death.
“The loss of a young life in such circumstances is truly devastating, and we recognise the profound impact this will have on all those who knew and loved her.”