Just for clarity, we know she did this with her own children. What poison she may or may not have dribbled or poured into her classrooms we do not know. A sub teacher's relationship with classes is different from a teacher who is "there" every school day through an entire schoolyear. So, she may not have said anything, or she have viewed her job as expendable and done poison-dumps with regularity. Strangely, I'm inclined to think she said little, as she would not have the authority-trust relationship fulltime teachers would.
But, knowing this, would a thinking parent trust her? And her hubby is a LtC in CNG? How has he influenced his unit ... how would they react to a Trump sign or bumper sticker when responding to an emergency?