The 23 year-old stroked the GB boat to a fast start and they were ahead after 500m but European champions, Romania and New Zealand proved too strong.
The Romanians came out on top, with the British eight comfortably holding off the challenge from the Netherlands
The GB eight now prepare for the World Championships in Sarasota in September.
There was no medal success for Enniskillen's Holly Nixon in the women's quadruple sculls.
Nixon and her GB team mates Bethany Bryan, Alice Baatz and Mathilda Hodgkins-Byrne, were always off the pace and finished fifth in a race won by Poland.

Just over 1,000 soldiers from two signals regiments and their families will be moving to Beacon Barracks.
Developer Lovell, based in nearby Tamworth, is building 346 homes on sites in the area.
They are expected to be completed at a rate of 15 a week, with the last ones handed over to the Ministry of Defence in September.
L/Cpl Richard Neely and his wife Rachel were the first to see inside their property and said the move would give them more "security" for the future.
"We're just looking for something more permanent now," Ms Neely said.
"This is our third move in two years. With a baby it's quite hard."
1st Armoured Division Signal Regiment and 16th Signal Regiment will join 22 Signal Regiment at Beacon Barracks as part of a wider shake-up of defence bases.
The Ministry of Defence plans to move 20,000 troops from bases in Germany to the UK between 2010 and 2020, ending a 70-year association with Germany.
Belfast's Rebecca Shorten won a bronze medal as part of the Great Britain women's eight at the final World Cup regatta of the season in Lucerne.
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The first keys have been handed over to new homes built for troops moving from Germany to Stafford.