In addition, her mine can do a lot of damage with a Scratch buff and since she's Will-based, she benefits from any Will-based buffs (I like to use a pet with Grants Steadying Speech).
Before Valencia 2, I used a crew of Scratch, the Shark and Mormo. Things went pretty smoothly with Scratch buffs and Blood Flames. But after getting hammered in a few battles in Valencia, I switched to using Gracie and things went much smoother. I typically don't use Doubloons much, perhaps they would have made a significant difference too.