The Club accepted an offer for the forward from the Championship side which will help us to continue to revamp the squad with new additions.
In the summer Follis had her contract extended for a further season, but she opted to move back to the Club where she began her career.
Follis arrived at Blues prior to the start of the 2017 WSL Spring Series.
Last season, she established herself in the first team after an injury hampered her first campaign at the Club.
Follis scored her first goal for the Blues in the 3-1 defeat to Arsenal and went on to score four goals in 20 appearances in 2018/19.
The Club would like to thank Emma for her efforts over the last two years and wish her every success in the future.