Standing in the 32-year-old's way is world number 75 Hercog, who stormed into her first WTA tour final since 2012 after dumping out Greece's Maria Sakkari 6-4 6-2 in 89 minutes.
Hercog, who returned to action last May after eight months on the sidelines with injuries toher shoulder, left knee and right wrist, overcame world number 122 Parmentier in three sets in their only previous meeting in Bogota seven years ago.
The Slovenian is also seeking the third title of her career after twice winning on the claycourts of Bastad, Sweden.
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by Ken Ferris)
