And incredibly even her breast didn't grew much
I thought they were bigger… :ninja:
Anyway she's a princess, not a soldier or pirate, so it probably wouldn't make much sense for her to train for anything. Her being nakama is merely a honorary title, not implication that she's gonna join the Straw Hats anytime soon!
Of course she may have had some training in case something like Crocodile happens again. It's always good to be able to take matters in your own hands should need arise!