Mostly in case the door was still booby-trapped, which she strongly suspected, but also because this was where Tom let Max in and out, anyway. After a moment, her raised arm descended, and Kozue herself appeared in Tom's window. Or, at least, the top portion of her head, and her bright, rapidly moving eyes, did. She did a quick search, looking for Sagaki, Max, or the both of them.
Her eyes were also… unusually colored. She had distinctly not put in her contacts before leaving her dorm; if Tom wanted to talk about family situations, he could talk about family situations.