Wilson made it through to the fourth.
Having now won on her last two outings and also had the opportunity to check out her Olympic rivals during the 51-nation competition in Central America, Fitzgibbons is brimming with confidence in the build up to the Games in Japan, where the sport will make its Olympic debut.
Fitzgibbons did it the hard way at Lo Bocana and El Sunzal surf breaks, securing gold by emerging unscathed from a total of 11 heats after having been relegated to the repecharge rounds last week.
But having navigated her way through to the final, the current world No 2 was able to claim gold with a 14.
Peruvian Daniella Rosas came in fourth.
We are going to the Olympics.
Just competing and seeing all the Olympians get their spots is great.