Allan consistently contributed during Adelaide’s inaugural Premiership in 2017, after being a 16th round selection in the 2016 AFLW Draft. She enjoyed a breakout year in 2018, finishing runner up in the Club Champion and earned the Best Defensive Player Award. Allan became a two-time premiership player in 2019 and was the rock of Adelaide’s defence. After two All Australian nominations, Allan earned her first selection in the team in 2020.