In an uneventful first half, Sylvans' keeper Kayleigh Marquis tipped a free-kick onto the bar.
But they came out brighter in the second half and quickly scored through Holden, who received the ball from Rochelle Vaudin on the right before her mazy run and finish.
The Saints' dominance grew and it was no surprise when they doubled their lead through Warren with 15 minutes left, after a strong but unopposed run from Lisa Sylvester.
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