Laptops were certainly not common consumer products in 1991. They were much more expensive than desktops. So, it's not impossible a student might have a laptop, but I was still typing university papers on my new electric typewriter in 1985, and darn glad I didn't have to use the library's manual typewriter any more. I don't think we got laptops at work until the 2000s.
So it's one of those things that you could make possible in your mind (maybe her parents were wealthy, or worked in the computer industry themselves so they had more access to "cutting edge" stuff), but it's pretty clear that the writer really thought laptops have been with us through the ages.