Proctor could only manage a best jump of 6.55 metres from her first three efforts – significantly below the 6.83m she posted in qualifying – as she failed to make the eight qualifiers for the final three jumps.
And the 22-year-old Anguilla-born athlete believes that she will be able to learn from her mistakes as she eyes Olympic success in Rio 2016.
“Today wasn’t my day. It’s a learning experience, I came out here and tried my best,” said Proctor, who broke the British record with her 6.95m jump at the Olympic trials this year.
“I was struggling on the runway, to be honest. I just couldn't get it right. I came and tried my best, though I can't say I'm satisfied.
“It’s anybody’s game and tonight it just wasn’t mine.
“After my first couple of jumps I got frustrated and lost focus and that was my biggest problem. Next time I’ll know not to lose focus and keep my eyes on the prize.”
USA’s Brittney Reese won the gold medal with her second jump of 7.12m as Elena Sokolova of Russia took silver with 7.07m – Reese’s compatriot Janay Deloach secured bronze with 6.89m.