Sussex Police said Frankie was last seen by her mother at home in Sompting on Sunday afternoon (August 23) and she hasn’t been in touch with family or local friends since.
CCTV footage shows Frankie at Three Bridges railway station on Monday morning.
She is described as white, 5’7” and of slim build with long light brown hair. She was last seen wearing black jeans with ripped knees with a black crop top and black Adidas trainers.
PC Mark Green said: “We are concerned about Frankie because of her age.
“We believe she boarded a train at Three Bridges Station and alighted at Balcombe Station and she could still be in that area.
“We have attended a number of addresses but are yet to gain information of her whereabouts.”
If you see Frankie or know where she has been email [email protected] or call 101 quoting serial 1603 23/8.
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