LOL! Mad funny idea; it may be a variety of different factors. Any stress the snake endures could cause it to decide not to eat.
Is it frozen? Maybe she didn't thaw it out and it was still cold...? The first time I fed my snake I picked up the mouse by it's tail (f/t) and wiggled it in front of my snakes head. The past three times I have fed it, I have used this method.