Two men are reported to have approached her while she was walking on The Hallow Way, an alleyway between Anne of Cleves Road and Priory Road, at around 7.25pm on 16 March 2021.
The suspects demanded she hand over her mobile phone and cash, before also making her remove two rings.
Both men were described as white, of slim build, and around five feet six inches tall. They were both wearing face masks.
One man was wearing a blue baseball cap and dark grey jogging bottoms with a dark grey hooded top.
The second suspect was also wearing a baseball cap, in addition to grey jogging bottoms and a grey hooded top.
Anyone who believed they saw the incident and has information which may assist the investigation is asked to call Kent Police on 01474 366149 quoting crime reference 46/43730/21.
You can also contact the independent charity Crimestoppers anonymously on 0800 555111 or complete the anonymous online form at Crimestoppers.