The grandmother of missing schoolgirl Tia Sharp broke down in tears as she told a press conference that she knows the 12-year-old is not staying away by choice.
As the clock ticked down to it being a week since Tia seemingly vanished without a trace, Christine Sharp, 46, said: "My only message to Tia is that I love her. She is my life. I don't know where she has gone. I don't know how she's gone. She's not staying away by choice, I know this. I just don't know what else to say."
Police are planning to hand out fliers on the tram and bus routes that serve New Addington, in south London.
Mrs Sharp added: "We will help the police and anybody and everybody else in every way I can, so will every member of my family. We are going to cause them no obstruction whatsoever. Whatever they want to do they can do it, no problem. I just want my baby back."
Mrs Sharp's partner Stuart Hazell, 37, was believed to be the last person to see Tia. She is thought to have headed to the Whitgift Centre in Croydon to buy flip-flops and agreed to be home at Mrs Sharp's terraced property at The Lindens by 6pm last Friday.
Mr Hazell, who was interviewed as a witness, has said another witness saw her leaving the house and he was not therefore the last person to see her after having spent Thursday night alone with Tia. She added that Tia's mother Natalie was "in bits" and she does not know where she is as "she needed to get away".
She said: "Stuart is out doing his own... we've all done our own little separate bit and Stuart's out doing that now."
In an interview with ITV News, Mr Hazell dismissed claims that his father had contradicted his version of events.
Mr Hazell said he last saw Tia as she left the house after breakfast. His father Keith claimed earlier that his son had walked her to the tram stop.
Mr Hazell said: "My dad likes a drink, he's got good intentions but he said everything back to front. If I'd have walked her to the tram stop, I would have come with her to Croydon, then none of this would have happened."