Why not? That's one way to go. Like Sanji only using his legs. She could jump higher than Brook and use her fin like Jinbe uses his fists.
There are so many other possibilities I can't even imagine. Like a trident with mythical Dragon Zoan, or using "Water Magic" and calling for fish like Jinbe.
In the end it's up to Oda.
It's just a possibility.
Yes, he didn't name her as a formidable warrior, she didn't avoid the flying axe, and she didn't leave the island with Jinbe. But none of that is really conclusive.