Playing 12U U trip. Pitcher off the rubber, adjusts her mask with throwing hand, steps on the rubber and pitches. Ump calls illegal pitch. No explination from ump and coach doesn't question due to final minute of drop dead time. Pitcher not knowing, adjusts mask again. Illegal pitch called after the pitch and time runs out. Umpire says anytime pitcher goes anywhere near her face with her throwing hand, she has to wipe off her hand before touching the ball. Is that the rule?