Abi, who is also known by the name Blu, has been missing from home since 17 April.
Abi is ft 4in tall, and of a slim build. She has long hair reaching down to her shoulders.
She was last seen wearing a light blue halter-neck top, a brown jacket with a fur-lined collar, navy blue jogging pants and black shoes.
Merseyside Police stated: "Abi, who also uses the name Blu, has been missing from home since 17 April and extensive enquiries are ongoing to find her.
"She is 5ft 4in tall, of slim build with long hair, reaching her shoulder blades, which is dyed half black and half pink.”