Enquiries by the Metropolitan Police are underway to try and locate her.
A tweet from Haringey Police, posted shortly after 11pm (BST) on Friday, said Marina has been reported missing from the London area since last Wednesday.
— MPS Haringey (@MPSHaringey) August 9, 2019
It follows an earlier message on Twitter from the charity Missing People, who are also appealing for more information in relation to her disappearance.
Speaking to TenEighty, the Metropolitan Police said: “Marina Joyce, 22, was reported missing to police on Wednesday, 7 August. It was reported she was last seen on 31 July.”
Anyone with information is being asked to call police in the North Area Command Unit on 101, quoting the reference 19MIS031063.