Shay, 15, was last seen by her family around 12pm on Sunday 1 August and they are extremely concerned for her welfare.
Shay is described as being white, around 5ft 2 ins tall, of medium build and with dark hair down to just below her shoulders, and has a nose piercing on both sides.
When she was last seen, she was wearing charcoal coloured jeans, a white hoodie and black trainers. She also had a striped beige, red and blue shoulder bag.
If you have any information about her whereabouts please call 101, quoting the reference 44210305969.