Chloe was last seen by her family on Sunday October 23.
Lincolnshire Police believe Chloe will be wearing jeans and a green jumper with white trainers, but could have changed her clothes.
She is described as white, slim with very long brown hair, she has pink braces on her teeth.
A police spokesperson said: “We appeal for Chloe to get in touch with us or her family or anyone that knows where Chloe is.
“Anyone with any information is asked to call the non-emergency number 101, or alternatively the charity Missing People on 116 000.”