I actually did an internship at a TV station, and a PA is basically a glorified intern who gets paid. On the production side of things, I reported to the technical director, who in turn reports to a show's executive producer. Most of my days involved setting up or taking down studio equipment (lights, cameras, cables), preparing graphics for the chyron or text for the teleprompter, and lots of sweeping the floor.
If she's focused on journalism, though, perhaps she could be a writer's assistant, copy editor, fact checker, logging tapes/transcribing interviews. Basically someone who does all the menial tasks that no one else wants. I suppose she could move up to being a producer or someone in charge of guest bookings or perhaps the director in the booth telling them which camera to take when (aka "God"). Responsibilities and duties aren't set in stone; depending on a show's budget/size/union considerations, people tend to be flexible and do whatever's necessary to get the show on the air and on time.
Good luck with your writing, and don't get too worried about the details.
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