A bronze medalist in this event four years ago in London, Hartley failed to reach the same heights in Rio as she missed out on the final after a fifth place finish in her semi-final.
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Hartley recorded a time of 2m01.89s in the B final, finishing over 3 seconds behind Britain's Rachel Cawthorn who claimed seventh place.
Russia's Elena Anyushina recorded victory in the consolation final with a time of 1m57.20s.
In the main final, Hungary's Danuta Kozak took the gold medal ahead of second-placed Dane Emma Jorgensen and New Zealand's Lisa Carrington, who claimed the bronze.