Williams played at club level for Millwall Lionesses and spent two years in Italy with Juve Siderno.

[4] She also appeared in the first edition of the UEFA Women's Champions League in the 2001–02 season, reaching the quarterfinals with Arsenal.

She was allotted 97 when the FA announced their legacy numbers scheme to honour the 50th anniversary of England's inaugural international.

[10][11] Williams joined the coaching staff at Arsenal's Centre of Excellence, later taking on a similar role at Watford, before becoming the manager of the Welsh national team in 2000.

Williams became manager of Watford Ladies in the 2006 close season and led the side to promotion to the FA Women's Premier League at the end of the campaign.