The big difference here was that the batsman was in her ground until the bowler entered her action. If you watch it through all she does is lift her bat as she turns to face the other end - she isn't sprinting down the wicket to try and gain an advantage, nor has she been given the courtesy of a warning (though what she'd have been warned for I don't really know, as she wasn't trying to gain an advantage) - so in my opinion the bowler has made a deliberate attempt to dupe her out of her crease, which is no different really to fielders fake calling or pretending the ball is coming in when it isn't.
Basically, a low, dirty move.
When I was coaching, I was umpiring an U17 match when my side did something similar. I had a brief discussion with the captain as to whether he really wanted to maintain the appeal - he came up with "well, I'm in charge, so yes", to which I replied "well, next week you won't be then!"