I have to believe she will be charged. No wiggle room on that decision. She'll get fired, too.
The piece of info that impressed me is:
" A staff member who was worried about safety after the tragedy in Connecticut brought her own loaded gun to an elementary school on Wednesday."
She made a conscious decision, with her very own rationale, to violate the law. But that's not a good sign for the "we-need-to-arm-some-teachers!" crowd.
Also impressive is that a chick is wanting to shoot a .357 magnum j-frame. That HURTS!