Piratica — Tanith Lee

Artemesia--also known as Art--spent her childhood on a pirate ship, and she's sick of practicing deportment at the Angels Academy for Young Maidens. Escaping, she sets out to find her mother's crew and breezily commands them out to sea. Fiery Art soon shapes her men into the cleverest pirate band afloat. And then they meet the dread ship Enemy and her beautiful, treacherous captain, Goldie Girl. The Seven Seas aren't large enough for two pirate queens. Art will have to wage the battle of her life to win her mother's title--and the race for the greatest treasure in pirate lore!