Corrected entry: The Tooth Fairy apparently only kills those who have seen her, but throughout the movie she kills several people who didn't see her at all, just happened to be in the wrong place at the wrong time. For example, after the lift scene, Caitlyn, Kyle, Michael, a doctor and a nurse run down the corridors where they meet another nurse. She is the next to be killed (snatched from behind, so she didn't even see the fairy then), even though she wasn't in the prior scene where everyone saw the fairy (and thus became a target). (Regardless if there is a deleted scene that offers an explanation, it is still a mistake within the actual film.)
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Correction: Everyone who sees her is killed. Most of the one's who 'didn't' actually caught a glimpse of her, before she carried them off. As for the nurse, we didn't see her killed. It's possible the Tooth Fairy merely carried her off to scare the others, or to separate their group and make for easier targets. Also, just because we didn't see them when they saw the Tooth Fairy, it doesn't mean they didn't. As you said they were hiding in the hospital; it's possible they saw her there, and were protected by emergency lights.