She was signed as a priority player before the 2016 AFL Women's draft. She made her debut against Adelaide at Thebarton Oval in round one of the 2017 season. McWilliams played every match in her debut season to finish with seven games, and was Greater Western Sydney's top goal-kicker with seven goals.[1]
Prior to her AFLW career, McWilliams was communications co-ordinator for the Melbourne Cricket Club.[5] To allow more time to concentrate on her football career, McWilliams became a freelance journalist.[6]