And, just moments later, it was two as Galton latched onto Janssen’s pass over the top and blasted home with her left foot.
With the Reds having to push on in search of goals after the interval, United were able to exploit the space that left and only a brilliant last-ditch tackle from Gemma Bonner prevented Galton from grabbing her second of the afternoon.
But United did increase their lead on the hour when Janssen located the bottom corner from the edge of the area.
Teagan Micah then did well to palm Grace Clinton’s shot from range wide, but the Liverpool goalkeeper was beaten again with a little under 10 minutes remaining as Mallard volleyed in Janssen’s delivery to the back post.
Team
Liverpool: Micah, Fisk (Daniels, 77), Bonner, Matthews (Clark, 63), Hinds, Nagano, Shaw, Holland (Duffy, 90), Enderby (Fahey, 77), Smith, Kapocs (Kiernan, 63).
Unused sub: Spencer.
Next up
Liverpool return to action on Wednesday evening when they host Everton at St Helens Stadium in the Women's League Cup (6pm GMT kick-off). Watch the tie live on LFCTV and LFCTV GO.