Cyn was probably well handled and exposed to a lot of different things when she was a foal. Bob(TheBiter) is alot like that. Sometimes, you just can't get him out of your face. She's probably reading your body language too and know's that you're just goofing with her and aren't really trying to "get" her. I'm sure that if you got after her for real, with real intent to hit her, she'd get moving in a hurry. It's cool that she's that perceptive to minute changes in your body language, but it can get aggravating because you've got to REALLY mean something when you tell her to do it, you can't get away with telling her to "do as I say, not as I do". ;o)
You're right. She is 'bomb-proof to a fault' in that you can't get her out of your way either. All I have to do is cluck at Bay and he moves out of the way. She'll stand there with me slapping her and not 'move it'.
She was bottle fed, as her mother had to be put down after the birth, so she is perhaps "too imprinted" ;~D