The first qualifying run left Britt in 26th, then up to 11th.
In the second qualifying run Britt made it onto the finals, moving into the top spot after the first finals run after which she held that position in the superfinal.
Execution, speed and detail were all on show as Britt skiied a brilliant run to score 73.81 in the final ahead of Perrine Laffont (FRA) close behind on 73.13 and Keaton McCargo (USA) on 71.78.
Watch Britt's historic gold by clicking https://instagram.com/p/BN2a26zhexW/