It is well known that the library is the safest place in the school. It's at the top level of the Scholomance, and its bookshelves extend all the way up, to the safety of the void above. It is as far away as physically possible from the entrance and exit of the school, which is of course at the very bottom. There are precious few vents in the library to let in air, and what little ones that are here are small. Because of this, the whole place smells musty and stale and quite like ancient books that have been forgotten for centuries. There's also no plumbing on this level, either, so any restroom or water breaks involve a long trip down to the cafeteria level, which is just as annoying as it sounds. All of this inconvenience comes with the benefit that the maleficaria are just as inconvenienced, though. Which means, for however dark it is, how much it smells, how inconvenient it is to ever need to pee, however much the shelves and their contents don't always like to stay put, for how easy it is to get lost in the stacks with aisles that change length and that all look the same... it's where everyone wants to be.
The reading rooms are especially favored, because they're actually comfortable. There's a main one, nicely centralized, conveniently located near the stairs up and down without being directly in front of them, whose tables and couches are jealously guarded. Each set is claimed by the major enclaves, and the whole thing is the hub of library related social activity. Yvette is not, and will likely never be, welcome there. She doesn't bother looking there for anything but mals, and just walks right past without so much as a forlorn glance. Up on the mezzanine, there are a couple smaller reading rooms that are a bit less set in ownership; controlled by shifting alliances of minor enclaves, maybe particularly powerful independent alliances, and the like. The rooms there are both more out of the way and less comfortable, but if anything they're guarded more jealously. They're closer to being edged out, and there's less comfort of an established power base. Obviously, Yvette is somehow even less welcome there, maleficer that she appears to be, because she could maybe even actually be a threat.
So of course, Yvette has nothing to do with any of that. For her freshman year, she'd just bring books down to her room to work. This was a little bit inconvenient, but it worked all right for her first year here, and at the time, it hadn't been all that long to walk. The freshman dorms are just below the library's level, on the outer ring of the cylinder of their school. The trouble comes when one makes it to the next year. Each year, the dorms descend a level, grinding slowly down an almost impossibly large screw-like threaded monstrosity on the school. Freshmen, at the very top, far away from the horrors that wait for them below in the graduation hall, are the safest. Seniors, at the very bottom, are... distinctly not. Put the most powerful and capable students in front, between the monsters and the youngest children, and all of that. Which meant that once sophomore year hit, she had twice as many stairs she needed to go down to bring books to her room. Rather put a damper in that strategy.