Could there be a compromise.
How about the teacher stands still and bows her head for a moment when a pupil, or group of pupils pass by?
That way, she would show that just as she is worthy of respect, so are the young people who allow her to stay in post.
After all, if the pupils complain about the head to their parents and the parents think it is justified, she could-and should-be out on her ear.
It is a symbiotic relationship and no way should the children feel that respect is a one way street.
OP. I would make an appointment with the head in order to talk this through-she will probably be glad that you have given thought and time to her.
No way would I have my child trapped in this medieval mindset and, after all, she's just a teacher not the Prime Minister!
Children need respect more than adults!
I