"Nobody wanted to work. We'd attack, the field would work hard to catch the break, and then they'd sit up over and over.
"By the end of the first lap, it was pretty clear that a breakaway wasn't going to win."
Things closed up again when the woman riders let the men's group go by them, with her ISCorp team deciding the Kiwi should go for the finish.
"The girls got me into good position for the last climb and by the top, eight riders had a gap on the rest of the field.
"I hit the downhill section hard and the uphill section even harder.
"I led out the sprint and nobody was able to come around me."
Giddens said in 12 years of athletics and then cycling it had always been a goal to win a race on her birthday.
Her next assignment is the Tour of the Battenkill road race in New York on April 14, followed by tours in Arkansas, New Mexico and Missouri through to mid-May.