The 26-year-old victim, who suffered a fractured jaw, was involved in an argument with a group of people in the upstairs eating area of McDonald's in Briggate.
He was hit in the face in the incident around 9.40pm on Friday, October 26, causing him to fall to the floor.
He was then assaulted again on the floor.
A 16-year-old boy has been interviewed in relation to the incident and released under investigation following an earlier appeal.
Officers now want to identify the female suspect shown in the images.
She was described as mixed race. in her late teen, with her hair in braids.
Anyone who recognises her or who has any information that could assist the investigation is asked to contact DC 4159 Fisher of Leeds District CID via 101 quoting crime reference 13180542816 or call the independent charity Crimestoppers anonymously on 0800 555 111.