JOSEPHINE Hearne (20) was punched at the Brighton Hotel on February 4.
She said she was dancing with friends on the dance floor at 12am when a woman approached her and punched her in the face.
Ms Hearne sustained a black eye and a cut above her right eye and required treatment at Peel Health Campus.
Police have released CCTV footage of a woman they would like to speak to.
Call Crime Stoppers on 1800 333 000.