Reading someone's email?

I have a scenario I need assistance with: the librarian at the school I work for read another teacher's email on their assigned iPad after they turned it in at the end of the year. She didn't go digging for it, it just happened to be up when she was going through and wiping all the teacher iPads for the year. In the email, this teacher had written a friend discussing how she was thinking about running away with her child, which was against the custody agreement with her ex-husband (also a teacher in the system). The librarian felt it was the right thing to do to let the ex-husband know, in case the woman tried to do something. They are heading to court in the next few days and the ex-husband asked the librarian to write something up about the email (they didn't print it out). Can the librarian get in trouble for reading the email and then giving that information out? Serious responses, please.

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