What year do we think Shona is living in?
If she is just 3 or 4 years ahead, and is planning on rewatching the final season of Game of Thrones again, I'm not sure if I hate her or love her for having access to that when I don't.
Other companions, have had access to the TARDIS libraries and seen a lot of things that they shouldn't have. Just the other week, Ace called someone Buzz Lightyear, which didn't make much sense until you remembered that she had had free access to the TARDIS libraries for the last two decades and of course she would have devoured every Pixar had ever made.