With a 14-under-par aggregate of 278, Davies finished three strokes clear of the Australian, Wendy Doolan, whose compatriot, Mardi Lunn, shared third pace with Laure de Lorenzi, of France.
Davies was stung on the 12th tee of the St Pierre course but nothing could halt her as she equalled the American Express Tour record of 21 victories set by Scotland's Dale Reid.
Davies, two strokes clear of the field at the start of the final round, suffered a double bogey seven at the first hole and was left sharing the lead with de Lorenzi, who birdied the second.
However, after opening up a two-stroke lead at the turn, Davies hit birdies at the 11th and 12th.
That gave her the edge over Doolan, who scored four birdies as she raced home in 33 for her round of 71.Reuse content