Gonzalez crossed the line first in a new championships record of 1:29.24. However as she crossed the line she collapsed unconscious and was treated immediately by medical staff on the site.
Brazilian walker Erica de Sena won the silver medal with a time of 1:30:03, while Ecuador's Paola Perez took bronze in 1:31:53.
Total of 5 walkers dropped the race due to hard weather conditions.
In the men's 20km race walk competition Canadian's went 1-2 with Evan Dunfee winning Pan American title and Gomez Inaki taking silver.
Dunfee crossed the line with a time of 1:23:06 while Inaki was more than a minute behind in 1:24:25. Brazil's Bonfim Caio took bronze finishing after 1:24:43.