The Empty Toilet Paper Roll

You know what really grinds my gears? When my roommate can't manage to replace the emply toilet paper roll. Whenever she is the one to finish the toilet paper she will get a roll and put it on this shelf rather than replacing the empty toilet paper roll on the holder. I don't know if she is completely oblivious to it, doesn't know how to replace it, or simply does it just to drive me crazy.