Megan Whiteford came on a sub for City at half time and scored a hat-trick within nine minutes of being on the pitch.
Her first goal came after Karsey McGlinchey’s shot from the left back area was saved and Whiteford reacted quickest.
She then showed excellent technique for her second to control McCartney’s cross on her chest and volley into the net.
Whiteford’s hat trick was completed when she found herself one-on-one with a defender and cut inside onto her left foot before bending into the near corner.
Aberdeen managed to pull a goal back on 41 minutes. Henderson picked up the ball before beating two defenders and rifling a shot into the roof of the net.
But only a minute later City went on the attack again and made it 7-1. McGlichey ghosted in at the back post to latch onto a pass and side foot home.
McCartney got in on the act, gobbling up the rebound after Whiteford had rattled the crossbar with a fierce strike.
Sinclair joined her team-mate on a hat trick when she just beat Miller to a loose ball before rolling it in.
After Cara Henderson had strode forward to make in double figures, Sinclair got her fourth to overtake Whiteford in the scoring stakes.
Aberdeen rallied late on and Henderson attempted to get her second but Rachael Campbell denied her.
Bayley Hutchison then shot wide before Sinclair got her fifth of the match to wrap up the scoring.
In between all of this Miller had continued to make some incredible saves and double saves to stop further goals.