Her Manawatu time of 3hr 13min was seven minutes slower than 2011 because of strong winds.
"Coming back here, where it's hilly, was the challenge," she said. "It took some adjusting, that's for sure."
She will return to the US in April, planning to do some training in California before heading back to Wisconsin.
Her ISCorp Cycling Team team is likely to be even stronger in 2013 with a mixture of American and overseas riders helping continue her development.
But as Giddens said, there's more to it than just good results making like-minded friends helps with the long grind, while the sponsors want good role models to represent their brand.
"Even the team I'm with bases rider selection by personality and performance.
"You don't want to just turn up, race, then take off. It's a lonely enough sport as it is."
Giddens will have a club ride in Palmerston North tomorrow, and on the strength of that they will decide if she enters the upcoming Lake Taupo Cycle Challenge.