World No. 3 Saina scraped past the seventh-ranked Spaniard 19-21 25-23 21-16 in a see-saw battle lasting an hour and 19 minutes.
With the gruelling win, Saina maintained her 100 percent win against Carolina in three career meetings.
Top seed Kidambi Srikanth takes on third seed Parupalli Kashyap in an all-Indian men's singles final later today.
Saina showed steely resolve after losing the first game from a 16-12 cushion. The match could have been easier for the Hyderabadi had she not allowed Carolina to come back after gaining a healthy lead on more than one occasion.
The Hyderabadi did not repeat the mistakes of the first two games in the deciding third game, taking a 9-4 lead before wrapping up the match on her third match point.
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