Armitstead was drafted by Adelaide with their seventh selection and fifty-fifth overall in the 2016 AFL Women's draft. She made her debut in the twenty-five point win against the at VU Whitten Oval in round two of the 2017 season, but she tore her meniscus in her left knee during the match, which forced her to miss the remainder of the season. Due to her knee injury, the clubannounced in May that she was not offered a contract for the 2018 season, however in October it was announced that she would return to the club for the 2018 season under free agency rules. She was delisted again by Adelaide at the end of the 2018 season.