The point is that public schools have all adopted zero tolerance policies with regards to what the children should and should not bring to class. Her profession pulls this crap on kids day-in and day-out. Bring a butter knife to school in your lunchbox? That's worth a 1 week suspension. Actually take it out and butter something? That's another week. Now she's getting the same treatment and, imagine that, she doesn't like it!
She's a crabby old biddy whose job it is to make kid's (and their parent's) lives a living hell and now that she's in a bind she wants to wrap herself with those same children for protection. Afterall, it's fo' the chil'run