To be honest I know very little about the details of Kendra Turner's expulsion. However, given the track record of such incidences it is relatively safe to assume that the media has once again fucked-up the story. I seriously doubt she was expelled for just saying "bless you" after a classmate sneezed. Considering how most of these stories play out I'd be willing to bet that either she has a track record of interrupting and causing disturbances in class that led to the teacher's actions or she has a record of attempting to proselytize during school. In the end the details once they finally come out won't really matter since the religious right will latch on to their preferred version of the story either way.
"Student Says She Was Punished At School For Saying 'Bless You'"