Ribbon had two options when it came to hiding, either pick someplace and get really, really still or choose something where her pretty much constant motion would go unnoticed. In the House of Horrors, it would have been better, hiding wise, if she had gotten extremely still. However, she didn't want to stop making the noise especially since he seemed interested enough to come looking. In her mind, he wanted to find something, so he would find something. There was no real reason for her to run. After all, he wasn't a threat to her, just another one of the hundreds of people on the island, all of whom continued living mostly because she hadn't desired to kill them yet.
That was literally how Ribbon thought and so far, no one had managed to dissaude her from that notion. It was quite likely that no one would ever manage that with her. It required a complete overhaul of her thinking. Good luck with that idea.
She could hear the motion of the air around him as he levitated. Ribbon crunched into a little ball on one of the beams above the false ceiling, waiting for him to come all the way up. Then came the moment she'd been waiting for, the same moment she enjoyed with so many others, that moment of absolute panicked recognition. It drew what could only be called a smile to that very mask-like face. With Ribbon smiling, it was usually one of two things, she was amused or she was hungry. Amusement was so much safer for those around her.
His words went into her head, though she didn't immediately think to answer him. He floated back down, and she simply moved as if watching him, now hanging upside down, a motion extremely corpse like in the way her whole body seemed to go limp. Though the darkness moving around her only served to make things creepier.
No words, just her staring, no moving attempts to leave like someone who had been caught doing something that they shouldn't.