Her other victory this year came at Istanbul in April.
Parmentier, who is 4-0 in career finals, also saved three of four break points against her, while breaking Pegula four times.
Pegula, seeking her first title, broke early for a 3-1 lead in the first set before Parmentier battled back.
With the score 5-5, Pegula saved two break points, the second with an ace before Parmentier converted a third with a forehand winner to go up 6-5.
Serving for the set, the Frenchwoman came back from a 0-30 deficit and closed out the set four points later on another forehand winner.
Parmentier opened up a 4-0 lead in the second set and served out the match after Pegula had closed to within 5-2.
(Reporting by Gene Cherry in Raleigh, North Carolina; Editing by Christian Radnedge)
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