Frederick spent her early years in Brighton, England. Her mother is White British and her biological father is of Jamaican and Antiguan descent. Her step-father's surname "Traub" was added to her name as a child, but in 2020 she announced that she was reverting to the name "Frederick" for several reasons. Frederick and her family moved to Australia when she was seven, although she has said considers herself English and "my family still kept me immersed in the British culture. She grew up in Pinjarra, Western Australia.
Junior and state-league football
Frederick played in mixed-gender teams until the age of thirteen, when she began playing for the Peel Thunderbirds. She eventually progressed to the club's senior team in the West Australian Women's Football League. In 2013, Frederick captained an Australian youth girls team on a tour of New Zealand. She switched to for the 2014 WAWFL season, and in 2015 and 2016 played in exhibition matches for against the. She kicked three goals in the latter game.
AFL Women's career
Brisbane (2017–2019)
In July 2016, Frederick was selected by as one of the club's inaugural marquee players. She made her senior debut for Brisbane in round one of the 2017 season, against at Casey Fields. She was responsible for kicking the team's first goal of the competition. Frederick recorded 13 disposals, six marks, and a goal against in round four, for which she was nominated for the 2017 Rising Star award. On 17 May 2017, Brisbane announced they had signed Frederick for the 2018 season. Frederick was listed in the 2017 and 2018 All-Australian team. She was retrospectively named in the AFL Players Association's 2017-2019 22under22 team, which recognises the best young players in the league.
Richmond (2020–)
In April 2019, Frederick expressed a desire to move to Victoria. Frederick was traded to expansion club in exchange for a first round draft selection which was slated at the time to be pick 12 in the upcoming 2019 AFL Women's draft.
Frederick studied psychology at Murdoch University, and was part of the university's Elite Athlete Program. She previously worked at AFL Queensland as the Participation Programs Coordinator for Game Development. As of 2020, Frederick was engaged to be married to Lili Cadee-Matthews.
