Kershaw joined York from Wakefield Trinity in August 2021.
The centre or second-row was called up to the England Knights squad in 2022.
Kershaw featured in the 2022 BWSL Grand Final for York.
Emma is the sister of Wakefield Trinity winger Lee Kershaw.
Born in Bradford, Kershaw began playing rugby union aged 10 for Baildon RUFC before moving to Wakefield.