The incident happened at around 12.30am on Saturday 17 October 2020 in Beach Rise.
It is alleged there was altercation involving a group of people at an address during which the victim was assaulted in a communal doorway.
The woman, aged in her 20s, was taken to hospital for treatment to a facial cut.
Detective Inspector Julien Lawton of Margate CID said: ‘While detectives are completing enquiries in the area including forensic examinations, we are appealing for witnesses or anybody with information about the incident to contact us.
‘I would also ask motorists who may have been in the area to check for any dashcam footage that shows a group of people in Beach Rise between midnight and 1am, and local residents are requested to view home security CCTV or doorbell cameras for anything that may assist the investigation.’
Anyone with information should call Kent Police on 01843 222289, quoting reference 17-0042