Rosalind Smith, of Pine Ridge, told police she was approached by the group on Darenth Avenue at 6.45pm on Sunday June 23.
They allegedly tried to take items from her including her handbag, umbrella and a crutch.
The 54-year-old victim, who has four children, suffered an injury to her ribs during attempts by the suspects to remove the crutch.
Kent Police are investigating the incident and anyone with information is asked to call 01622 604100, quoting reference 46/120709/19.
Alternatively contact the charity Kent Crimestoppers anonymously on 0800 555111.
