Tori Lea Burgess was last seen in Huddersfield at about 4.50pm on Thursday.
It is believed she has travelled to Manchester, and enquiries are ongoing to locate her.
Tori Lea is described as being about 5ft 6ins tall and of slim build.
She was last seen wearing a brown jacket, a black Juicy tracksuit, red and black trainers and a baseball cap with the letter T on it.
There are concerns for Tori Lea’s welfare and anyone with information is asked to contact police in Kirklees on 101 or by using the 101LiveChat, quoting log reference 1717 of February 10.