Do you approve of teachers pushing political controversies down into elementary schools? Suppose she was coming down on the side of those defending the anthem and the flag. Would that be acceptable? Or should children in grade school get their views, if any, from what they hear their parents saying?
??? Of course it would be acceptable, indeed expected of her especially since it is a significant element of her job description (maintaining classroom control and conforming with the administration's program).
In fact, her superiors should quickly realize her intentional actions were clearly contrary to management's published intentions - normally grounds for termination, depending on who is in control.
(It is entirely possible that I misunderstand your statement or the context in which its made.)