Keep taking her, she'll get used to it. She's a cutie.
We took our two little ones to Clark Island today and they had an absolute blast. Lots of clean beach to explore and very few people, other dogs, etc. We could tell they were smiling from ear to ear the whole time!
Clark Island wouldn't be too far for you, and a world away from the mainland.
In the beginning one of ours hated the boat. She still prefers land, but is a lot more content while on the boat. She certainly like to be with the "pack" and likes the destinations.