Holcombe became the second team to secure their place at Finals Weekend, despite being held to a 2-2 draw at Slough.
Hannah Bowe put the hosts ahead before goals either side of the break from Sarah Jones and Steph Elliott put Holcombe ahead.
Louise Bevan scored the equaliser midway through the second half to earn Slough a vital point in their battle to avoid the relegation play-offs.
Canterbury made it two wins in a row after a 2-1 home victory over bottom side Reading.
Goals from Grace Balsdon and Sarah Kerly gave the hosts the points, despite Emma Thomas levelling the scores with nine minutes to go.
Investec Women’s Conference East
Wimbledon and Sevenoaks remain separated by just three points going into the final two league games after both sides recorded 3-1 away wins in the Investec Women’s Conference East.
Nicola Lloyd, Libby Sherriff and Laura Bevan were on target as leaders Wimbledon won at Harleston Magpies.
Sevenoaks won by the same margin at Southgate with Samantha Danckert, Kate Reynolds and Maddie Thompson on the scoresheet.
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