Lauryn Cass, from Bootle, was last seen on Friday, 18 May 2018 at Seaforth and Litherland train station.
She is known to frequent the Sefton area. Extensive enquiries have been ongoing to locate her since.
She is described as white, 5ft 2in tall, medium build, with long straight brown hair, glasses and a fair complexion.
When she was last seen Lauryn was wearing her school uniform.
Police officers are making extensive efforts to find Lauryn and return her home safely and would urge Lauryn, anyone who knows her whereabouts, or who has seen a female resembling her, to contact @MerPolCC or 101.
Alternatively information can be left with the independent charity Missing People by calling 116 000 or by emailing 116000@missingpeople.org.uk.
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