Paramedics and police officers were called to the scene in Broadway, Bexleyheath, around 11.15pm on December 16.
The victim was taken to hospital for treatment to her head injury.
Police investigating the assault on Tuesday released CCTV footage of a woman they would like to identify as part of their investigation.
Detective Constable Georgia Fair of the South East Command Unit said: “I am appealing to anyone who recognises the woman shown in this footage to get in contact.
“I am also appealing to anyone who was in the area around the Broadway, Bexleyheath on the night of the 16 December and witnessed this incident to get in touch.”
There have been no arrests and police continue to investigate the incident.
Anyone with information is asked to contact police on 101 or tweet @MetCC and quote CAD7508/16Dec. You can also provide information anonymously to the independent charity Crimestoppers on 0800 555 111.
