I think tat despite more information swirling around our heads these days, 'we' are in many ways more stupid than out predecessors. She was too hot in a room, therefore you open a door to cool down. Just not onboard a plane or train or bus.
That she wasn't under the influence of drink or drugs and was with children in her care, can only suggest that she's of low intelligence, or being kind became disorientated and acted on impulse.