The question is, who she cosplaying?

I would go with the name ship, unless there's an identifying feature.

By the puffy like sleevess looks like Jintsuu's style.

BlindSargent said:

By the puffy like sleevess looks like Jintsuu's style.

Looking at their original official art, it seems like Naka has puffier-looking sleeves than Sendai, but not as puffy as Jintsuu's. Frankly they seem closer to Naka's here, and she seems a closer match to Cocoa personality-wise. But I don't know... the apparent difference could be unintentional (with the official anime post #1938329 it doesn't really seem the three are different as far as their sleeves are concerned).

And Jintsuu's gloves are black.
So everything seems fine here (unless the artist says it's not Jintsuu^^).

The pose seems more Naka than any of her sistsrs'.

Provence said:

And Jintsuu's gloves are black.

All three of them have the same black gloves.

EB said:

All three of them have the same black gloves.

Really?
Well, if we talk about about the "normal" forms of them, you're right.
I was only aware of Naka's Kai Ni version (White gloves ^^).

E: Ok, forget it then. Jintsuu's gloves color changes as well^^.