Natasha was last seen on Thursday 11 July in Devon Street, in the Christchurch suburb of Sydenham, Canterbury police said in a Facebook post.
Both her family and police are concerned for her welfare.
Natasha has black shoulder-length hair and two nose piercings.
She was last seen wearing a green jacket, black track pants and Nike shoes.
Anyone who has seen Natasha or knows anything about her whereabouts is asked to call Police on 105, and to refer to file number 240712/6886.