Coaches standing repeatedly

[officialtony]

NFHS rules.
JV high school tri matches.
The coach is standing up between every point ( during dead ball ) and talking to her players - sometimes on the floor and sometimes on the bench. I advised her that she needed to remain seated and that she was only allowed up during time-outs and substitutions. She said " the new rule allows us to stand between points ". I said that was not the case and she repeated that she knew this was the new rule for this year.
I thought the new POE was to be sure that coaches remained in their seats officially by rule now.
Did I miss something or is she wrong?
I checked my book after the match and found NOTHING to support her statements.
Please provide an NFHS reference if she is correct.

Or should I have given her the Yellow Card?

Thanks in advance.