The girl was in Walthamstow between 12.15am and 12.30am on Saturday when she met three men, police said.
She was taken to a garage area at the end of Hibbert Road, near Theydon Street, where she was pinned down and raped by two of the men.
The girl managed to call a friend who came to the scene and they left together. The suspects then left the area.
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Darren Osborne, 48, allegedly mowed down worshippers attending Ramadan night prayers in June last year.
The woman was left with a fractured skull and an arm broken in several places after the attack in Brixton.
Isaiah's mother, Takesha Thomas, and father Lanre Haastrup from London, want treatment to continue.