If the second baseman had not caught that throw, it might have hit the runner in the helmet.
And, she really didn't start moving until the ball was bunted. I understand maybe hesitating for the "pullback slap", but there was no movement once the batter committed to bunt until the ball made contact with the bat.
hoover: I've got the real time video. My timing of the batter was 2.7 seconds from bat contact to 1B. She probably could have taken another .2 seconds off her time. She seems to me to slow down before she reached the bag. Additionally, she looked at the ball for longer than she should have.