Could she have just been doing the shake or shiver I call it.
I have one , my first male, and a few of his off spring that when you hold out in front of you they'll quiver.
Some say it's nervousness, but he's over 9 now, and that's just not it.
I've always felt some do it to ward off predators if they can't get to spray.
I mean if you picked up something to eat and it started vibrating you'd hesitate right!
So I believe it's there other way of making a break for it.All they need is a second of a released grip and they are gone.
Pokie does it when ever I pass him to someone new , and only when you hold him out from your body.
Some could be scared and do it, but I'm sure Pokie is not scared, he's just trying to let me know, he wants to be left alone.
So I would say they would do it out of fear, or protest, or just plain uncertainty.