Unbelievable.
This is abuse, pure and simple.
Fire her.
I'm not making excuses for the teacher, but there must have been a reason behind the rule.
I'm not going to be critical of a first year teacher dealing with 20 or more 6 and 7 year olds....and their mothers! I would rather dig ditches!!
I agree, she is a sadist freak, what do you bet she is a lesbian too?