I'm trying to imagine what you're saying (don't have my dvds on me at the moment) but I think you're right--the shadow shows that she was injured more to the middle of her back, but in the shot where all of them are running from Sharptooth (before the earthquake starts) it certainly isn't in the same spot.
I guess I need to watch the dvd and verify this, but I think if I'm thinking of the same point you're bringing up F-14, it could be a small error...the placement isn't that far off.