I would agree with HashiriyaR32 to a large extent, but not completely
They followed history mostly except for the twists that changes the fate of some ships in Midway, which occurred before Solomon Islands campaign. Hence, having her in her usual uniform would be correct. Had they followed her actual K2 design, it would be 'historically' wrong. (Since Kancolle anime (S1) is based mostly on history.)
But as Klashikari said, anime production requires quite some time prior to the release to design her K2, while in-game CGs requires a short period to do so. Who knows, maybe Shibafu haven't thought of how to draw Fubuki's K2 and the anime production went on doing it.
Spoiler for Movie:
Heck, even Kisaragi's K2 design is different from the game (Her jacket is a hoodie, and her ribbon is of a different design.)
Well, technically because she is NOT at K2 at all, but it's Kisaragi-Damaged 2 (改 and 壊...
which is used on certain Abyssals.)
Speaking of which, when can we have her on our side? I bet her stats are very good.