Rachel Williams' 78th minute strike was the only thing to separate the two sides in this open and free-flowing fixture.
Blues goalkeeper Marie Hourihan was called into action on several occasions, while at the other end Karen Carney and Jodie Taylor both tested Carly Telford.
Yet it was England international Williams who wrapped up the three points 12 minutes from times.
Chelsea Ladies: Telford, Ingle, Bonner, Bleazard, Lappin (Lander 35), Susi, Longhurst (Coombs 79), Buet, Davies, Santamaria.
Blues Ladies: Hourihan, Weston, Bassett, Westwood, Harrop, Aluko, Potter, Christiansen, Carney (Torkilsen 46), Taylor, Williams.