10 and under, most of the girls are not much bigger than the ball anyway! Really though, for this age, focus on the mechanics, that is where the rules apply, the arc will get less and less while little arms get stronger. The arc is somewhat expected, thus the shorter distance at this age. Now I have seen some umps call an arc illegal, but that is incorrect, and for some younger girls, it is not possible to throw without an arc.
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