So far, five people have been arrested as part of the inquiry into Owami Davies' disappearance, two on suspicion of murder and three on suspicion of kidnap - all of whom have been released on bail.
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She was reported missing to Essex Police by her family on 6 July, with the force later handing the file over to the Met on 23 July.
However, on Saturday, Scotland Yard revealed its officers had spoken to Ms Davies on 6 July, after responding to an address in Croydon to concerns over the welfare of a woman.
Both the police and ambulance service attended and spoke to Ms Davies, who told them she did not want help.
At the time, she had not been marked as a missing person on the police database, and was only established later to be Ms Davies during the investigation to find her.