The weirdness is that the random 13 year old apparently both:
A) Has experience on a proprietary server file explorer only that was almost exclusively in use in huge data centers at the time. And...
B) decides that the slow graphics heavy option is the right choice over a simple command line, while a raptor is actively breaking into the room to eat her.
Edit: and yes, I get that we're supposed to connect that her grandfather is rich and she grew up with all the best toys. Which arguably excuses A, anyway.
She didn’t have experience with it, but she was good with computers. When she realized what she was looking at, she made the famous exclamation. Not all that different than people posting stuff to Linux in the wild threads.
Fsn is what was up on the screen, so that’s what she used. Probably easier than figuring out how to get to the command line on an unfamiliar system.
Also I don't think a teenager being comfortable with a GUI, but not with a command line is a particularly big stretch. Kind of seems like the opposite would be more ridiculous.