Silver-Holmes and Campbell joined Sixers team mates wicketkeeper-batter Maddy Darke and experienced seamer Sarah Aley in the NSW Breakers side who lost to Western Australia at North Sydney Oval.
Darke, 18, also made her Breakers debut in round seven and the Final was just her second WNCL match. This season Darke made her Sixers debut alongside Campbell against the Sydney Thunder.
Campbell, 17, claimed 3-55 from nine overs in the Final finishing the competition with nine wickets from seven matches.
Silver-Holmes, 16, finished her debut season as the equal fifth leading wicket taker in the WNCL and second for the Breakers. She claimed 12 wickets at an average of 20.
Her tally included season best figures of 3-18 in a Player of the Match performance against Queensland at Hurstville Oval. This season was the second in magenta for Silver-Holmes after becoming the youngest ever Sixer to make her WBBL debut last season.
Six teenagers appeared in the Final for the Breakers.
Darke made a solid 36 at the top of the order in the Final.