Midwood made her county debut in 2014, for Leicestershire against Hampshire.[3] In her sixth match for the side, she achieved her List A high score, hitting 70* in a victory over Derbyshire.[4] The following season, she was the side's leading run-scorer, with 235 runs at an average of 39.16, as Leicestershire were promoted to Division 2 of the County Championship.[5] Midwood spent much of the 2017 season with Worcestershire as the side gained promotion in the Twenty20 Cup.[6][7] Midwood returned to Leicestershire for the next two seasons, before moving to Essex ahead of the 2020 season, and made her debut for her new side in the 2021 Women's Twenty20 Cup.[8][9] She played six matches in the tournament, scoring 33 runs and taking 4 wickets.[10][11] In the 2022 Women's Twenty20 Cup, Midwood scored 157 runs and took eight wickets, including returning figures of 4/7 against Cambridgeshire.[12][13][14] She re-joined Leicestershire ahead of the 2023 season.[15]
In 2020, Midwood played for Sunrisers in the Rachael Heyhoe Flint Trophy. She appeared in five matches, scoring 57 runs at an average of 14.25 and taking 2 wickets.[16][17] In 2021, it was announced that Midwood would also be taking on the role of Sports Science Consultant at Sunrisers.[18] She played just one match for the side that season, against Lightning in the Rachael Heyhoe Flint Trophy, scoring 10* and bowling eight overs with figures of 1/42.[19][20] Ahead of the 2022 season, Midwood joined Lightning, but did not play a match for the side that season.[21]