That's exactly what I just said.
Right, but internal communications are seldom garbled, rarely coded, usually in the same language and never ever scrambled. Hence she probably wasn't in the "communications lab" or anything having to do with communications. Any random part of the ship is likely to have at least one communications officer to help coordinate with other departments; wherever Uhura was, that was probably her little desk in the basement.
You're right. Uhura the highly qualified and specialized xenolinguist wasn't in a language lab. She was monitoring the pressure regulators for the ship's fuel tanks.
Whatever she was doing, having a row of computers stuffed along side a bunch of tanks with obvious pipes and valves coming from it doesn't a 23rd starship make.
Filming the Enterprise interiors in a friggin' factory was stupid. Because it looked like a damn factory not what one would expect a starship to look like. If something looks like what it is and not what it's supposed to be it takes you out of the movie. It's
distracting to me to see Kirk and Scotty elude Cupcake et.al. by running through steep industrial stairs and narrow catwalks between large vats because it looked like a factory. Not a starship. The scenes with the Kelvin were worse with the concrete floors and the fadding paint on the
damp floors. Please.

It looked dumb.
It looked like a facotry, not a spaceship.
It reminded me heavily of the movie "Space Mutiny" which was pretty much filmed the same way. "Hey. this is a futuristic spaceship, but we're going to film the interior scenes in a factory!" The only thing this movie needed was some railing kills. To quote Tom Servo, "This spaceship has a huge basement."
This one of my biggest, and very few, gripes about this movie. Filming the interior ship scenes in a factory was dumb, it looked dumb, and it looked like a factory.