It would seem that pirate queens existed long before the 17th/18th century, the Spanish Main and swash-buckling as we know it. There was a certain French noblewoman in the 14th century who took her revenge upon the French for executing her husband, and did all she could with her pirate fleet to help the England of Edward III. She even married an English nobleman.
To learn more of this extraordinary woman, look at the colourful illustrations at http://www.rejectedprincesses.com/princesses/jeanne-de-clisson
Then, when your interest has been stirred, find out more by Googling her name.