Leon had a 3-over 75 in the final round, while Fankhauser shot a 6-over 78 at Gillette Ridge Golf Club. They finished at 1-under 215 -- one shot better than two other players.
For Leon, who left the University of Georgia after two years to turn pro, the win came in just her second tournament on the Futures Tour.
Fankhauser, meanwhile, was looking for her second career win after breaking through last season. She has been a runner-up twice this season.
Ji Min Jeong (73) and Nicole Melton (73) tied for third place at even-par 216.