How can you be so sure? The vast majority of communication isn't verbal, and animals are far more attuned to body language than most humans are.
OP - Your snake isn't a machine. She will have behavioral nuances from day to day, just like any other animal. She'll get used to your shaking, if she hasn't already. I wouldn't worry at all.
I think she already has for the most part! Its not a trembling or anything. I was just curious
Thanks