Yes, I vaguely remember that during high school one day, maybe in a class or a study hall, Kathy gave a speech about how when she gets home from school she shuts herself in her room to be alone for some time and to get away from all the noise of her large and busy family of numerous siblings.
Yes, and who doesn't need to spend some time alone, thus to shut out the siblings? There was nothing unusual or special about that. Everybody probably has the same idea. We all need to spend time alone sometimes, although maybe not always.