The 28-year-old defender joined the club when the women's team was formed in July 2018 and has made 43 appearances in all competitions, scoring three goals.
She follows Kirsty Hanson in agreeing a new deal with the Reds.
Amy Turner said:
“I'm really happy to be continuing my journey with this fantastic club, I knew when I joined that we would be creating something special here and I can't wait to get back to playing football next season. I want to thank Casey and the coaching staff for their guidance over the last couple of years, and also the fans for all of the support they give us.