“She is someone with plenty of experience, having played at the top level for Chelsea, and will add to our defensive options.
“Her versatility will also prove to be very useful, as she can play anywhere across the back line.
“I am very much looking forward to working with her this season.”
Williams previously played in FA Women’s Super League 1 for Chelsea, before moving on to Doncaster Rovers Belles and Sunderland.
The defender has also represented England at youth team level, and has been capped up to the under-23s.