I am not familiar with the NFHS rules about the actual pitching motion. I have been educated about the "step backward as long as it begins before the hands come together" difference with, for instance, ASA.
But I saw this in my twin DDs HS game last night: At times, the opposing pitcher began her 'wind-up' by bringing the hands together, then taking her pitching arm backwards through a reverse-looking wind-up [the direction of an exaggerated baseball pitch] and touching her wrists together, before beginning the traditional windmill-and-release towards the plate. *This is the best way I can describe her motion*. In essence she is passing her arm through 2 rotations--one overhand and then one underhand.
What does the NFHS rulebook say about the pitching arm motion? What is the comparable wording from the ASA book [it has been years since I had a copy of the ASA rulebook and do not remember the specifics about pitching].