The 24-year-old, who is competing in four events in the Czech Republic, partnered Angela Hannah in the K2 500 A final where the pair finished eighth and just 40 minutes later was back in her boat to finish third in the individual event.
"I was paddling up to the start thinking this will be interesting, but once I got racing I just focused on the task in hand," said Belcher afterwards.
"I stuck to my race plan which was to get out hard, settle into a nice rhythm, then pick up a half way.
"The last 200 was just kick and go, so it was about maintaining and holding position."
Belcher just missed out on the silver medal to Australian Naomi Flood, with New Zealand's Teneale Hatton taking gold. Great Britain's Luisa Sawers finished in seventh place.
� Sportsbeat 2014