@DJAtomikaJonathan is in the process of entering another level of the inception, so to speak. She wouldn't hear the thing in the vents unless she's in a compromised state of mind, (strong emotions, overwhelmed by information, dizzy from getting up too fast, asleep, on drugs, etc.) and they might not be percieving the same thing. Though I guess she might hear Jonathan himself, if he's panicked enough.