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.
No, she's a communications officer. She was probably routing status reports and forms from the guys who were monitoring the pressure regulators.
Xenolinguist or not, she WAS, in fact, a fresh academy graduate with no experience and no credentials. There are only so many positions for xenolinguists on a starship, with a much greater need for rank-and-file paper pushers performing the far more mundane tasks that are required for making a starship run.
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.
And for the second time I am compelled to ask, How do you know what a 23rd century starship looks like?
I thought you said it looked like a brewery? Eh... okay, but same question: how do you know what a factory looks like?It looked like a facotry, not a spaceship.