BlueDevil covered 1 and 2. I need a bit more information in order to address 3.
Is the pitcher stepping onto the pitchers plate and immediately going into her pitching motion? If so, then this is illegal and needs to be called.
Even if she already has her "signal" or knows what she is going to throw, she must step onto the PP, Pause with her hands separated, and look at the catcher.
The purpose of this piece of the pitching rule has nothing to do with where she actually gets her signal from, it is for the batter to know that she is getting into position to pitch.
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