Also (as technicality-me kicks in): you said she'll seem like just a regular student, but would it be okay if Chad can sense that something ain't right? While it's canon for him to be able to sense things like that, it's also canon that his spiritual powers are helped by his friend Ichigo. It would be logical that, if you'd prefer he couldn't tell, he can't, because he's been away from Ichigo's influence for a while now.