Demi-Leigh Leadbeater, 16, disappeared last Wednesday February 20 after last being spotted at a house in Northwood Avenue, Chaddesden, Derby, East Midlands, at around 9pm.
Police are becoming increasingly concerned and mum, Zara Notcutt, has urged her daughter to come home.
She said police returned Demi to their home after going missing only a couple days before going missing once again.
“We’re kind of in limbo at the moment and it’s not been a good week for us,” she said.
This morning it was reported how another of Mrs Notcutt’s daughters, Frankie, was “viciously attacked” over a pair of “lost property trainers”.
She said: “Demi-Leigh has left before but this time, she left and took all her clothes.
“She tends to hang out in the city centre but she’s made a new group of friends and appears to be in with the wrong crowd.
“She has no money to look after herself. We just want her to come home and get some help with what she’s going through. It’s been awful.”
Derbyshire Police has launched an appeal in a bid to find the teen.
The youngster – who says she has worked for Models 1 modelling agency on Facebook – was last seen wearing a white top, black jeans and a khaki jacket.
She is described as being 5ft 3ins tall, slim with very long straight black hair.
Anyone with any information about her whereabouts is asked to contact the force on social media, by dialling 101 or messaging Derbyshire police via its social media channels on Facebook or Twitter, or the Derbyshire Constabulary website.