Walker spent her youth career with Stoke City eventually making a debut for the first team in 2013.[3][4]
Liverpool FC, 2014
Walker joined Liverpool for the 2014 FA WSL season. Walker made two appearances during the regular season.[5] Liverpool finished in first place with a 7–2–5 record.[6]
Everton FC, 2015–19
In February 2015, Walker signed for the recently relegated Merseyside rivals, Everton of the WSL 2.[7]
Walker would become a regular for the Blues and played forward as striker, helping Everton with the Spring Series with seven goals in nine appearances.[2] The Blues were promoted to WSL 1 for the 2017-18 season and signed Walker to a 2-year full-time professional contract.[8] In December 2017, Walker suffered a hamstring injury and would miss the remainder for the 2017-18 season.[9]
Birmingham City, 2019–2021
In January 2019, Walker went on loan to Birmingham City for the 2018–19 FA WSL season. After featuring 17 times and scoring once, she was offered a two-year contract by the club. She made the permanent switch from Everton in June 2019, signing a two-year contract.[10][11]
During the 2019–20 FA WSL season, Walker was a starting player in 10 of the 13 games she played.[12] Birmingham City finished in 11th place with a 2–10–1 record.[13] In June 2020, she was awarded the PFA Community Champion Award.[14]
Returning to Birmingham City for the 2020–21 season, Walker scored her first goal of the season during a 5–2 loss to Manchester City.[15] She scored the game-winning goal in a 1–0 win against Reading on 11 October.[16] Seven days later on 18 October, she scored a 50th minute "wonder goal" in a 4–0 win against Bristol City.[17] Her fifth goal of the season was the game winner during a 1–0 over Aston Villa on 14 November.[18]
Walker has represented England on the under-17, under-19 and under-23 national teams. She captained the under-19 national team during the first game of the 2014 UEFA Championship, scoring the only goal for England in the tournament.[5] In 2017, she competed with the under-23 national team at the 2017 Nordic Tournament. Walker scored two goals in the opening match against Sweden and England would go on to win the tournament.[21]