The Sky Academy Sports Scholar, who placed fifth in the women's 1500m final on Friday, finished behind Korea's Park Seung-hi in second place, with China's Fan Kexin claiming bronze.
Christie, 23, was penalised in all three of her distance events at the Winter Olympics in Sochi, but led from the front in the Montreal final before being beaten by Park, who overtook her on the final bend.
The Livingston-born skater narrowly missed out on a second medal of the Championships in the 1000m on Sunday, finishing fourth as Shim Suk-Hee of Korea took the gold.
Meanwhile, Great Britain's men's 5000m relay team claimed bronze in Sunday's final.
Jon Eley, Paul Stanley, Jack Whelboure and Richard Shoebridge finished second in their semi-final heat behind Russia to qualify for the showdown with Korea and the Netherlands.
The British men earned their place in the final with the second-fastest qualifying time in the two semi-final heats.