Davies began coaching aged 15 for Erdington Ladies under-10 and under-12 youth teams, where her sister played.
League Managers' Association chair Marieanne Spacey-Cale commented this was due to "the work Gemma and her team has done over the summer, bringing in new signings and technical work on the training pitch...".
[6] After the season was ended prematurely due to the COVID-19 pandemic,[7] Davies led Aston Villa in an unbeaten run to promotion to the Women's Super League (WSL), with a record 13 wins and 1 draw.
[10] In October 2021, Davies became the head coach for the England women's under-19 team, beginning with 2022 U19 Championship qualification.
[13] In the summer of 2023, Davies joined former footballers Remi Allen and Anita Asante as coaches of the England women's under-23 team.