Scott Rogers' charges put on an impressive display against the Scottish Cup winners as they prepare for the start of the 2017 FA Women's Spring Series campaign.
After a goalless first 45 minutes, Weir broke the deadlock from close range against her old club.
Weir then made it 2-0 with a sublime strike when she caught the Hibs goalkeeper off her line and found the net with a 45-yard effort.
Natasha Harding added the final goal to complete the 3-0 victory.
Liverpool Ladies start their Spring Series campaign on Sunday April 23 when they travel to Yeovil Town Ladies.