After joining Arsenal at youth team level from Watford Ladies, Davison became a regular player and won several trophies.

Davison is a full senior international player for the England women's national football team.

[5] In 2010 Davison joined Chelsea Ladies pair Eartha Pond and Ann-Marie Heatherson at professional USL W-League club Buffalo Flash.

Having played just five games in 2010 she proved influential in the final, scoring a goal in Buffalo's 3–1 win over the Vancouver Whitecaps.

The 2013 season saw Davison selected for the PFA WSL Team of the Year along with fellow Arsenal teammates Jordan Nobbs and Danielle Carter.

Davison went on to provide six more goals in 26 appearances helping Chelsea lift their first FA WSL 1 title beating Manchester City W.F.C by two points.

The 2015 Women's FA Cup was the first to be held at Wembley Stadium and saw a 39-minute goal from Ji So-Yun secure a 1–0 victory over Notts County Ladies in front of 30,710.

In the 2016 season, Davison played in 22 games scoring 3 times as Chelsea finished second in the WSL 1 five points behind Manchester City W.F.C.

Davison played the full game as Chelsea scored a winning goal in extra time sending them to final to face Arsenal Ladies.

Chelsea had the opportunity to retain their title against Arsenal but failed to score after an early goal from Danielle Carter at Wembley Stadium in front of 32,912 fans.

Davison was allotted 172 when the FA announced their legacy numbers scheme to honour the 50th anniversary of England's inaugural international.