The 22-year-old earned $225,000 for her fifth career LPGA victory, taking her to second on this year's money list and the Tour's season-long points Race to the CME Globe.
Only three Australians have more career wins -- Karrie Webb (41), Jan Stephenson (16) and Rachel Hetherington (eight).
"The first half of the year I've been playing pretty solid. I felt it was close so I feel pretty good with this one," said Lee.
World number one Ko Jin-young (69), who also leads the money and points standings, finished tied for fifth on eight-under 276.
(Reporting by Andrew Both in Cary, North Carolina; Editing by Peter Rutherford)
Source Reuters