I think it's more the fact of the absence of knuckles on either side of that finger. Instead of a "flat" folded-finger accompaniment on each side, the other finger slope in a delta-shape. Make the same gesture with your own hand and compare to what she's showing in that pic...it ain't natural!
Also, am I nuts or does the shadow still show two fingers?
Also, read the time of my post (01:56 AM). I just got back from my brothers wedding, so I'd say I did a pretty good job considering the circumstances :wink: