The family of Georgina Gharsallah has arranged a candlelit vigil on the day of her 31st birthday.
It's been more than 7 months since she was last seen in her home town of Worthing on Clifton Road - she was reported missing on 17th March - the major crime team took over the investigation on 26th March.
Sussex Police said officers were "continually reviewing Georgina's case" and still appealing for information.
They say she was caught on CCTV in a phone shop, with what police say 'a number of mobile phones'.
Two men were arrested on suspicion of murder after Ms Gharsallah went missing but were later released with no further action.
"Georgina was, and still is, being treated as a high-risk missing person," a police spokeswoman said.
She's described as 5ft 2in (1.57m) tall, with shoulder-length dark hair, often worn in a top knot. She has a piercing above her left lip.
Georgina has Arabian features and speaks Arabic among friends.
The candlelit vigil is being held on Monday 29th October on the forecourt of Worthing Railway Station from 7:30pm.