I suspect as much too. I also suspect that perhaps Liz knows that her adversary, Angelique, is a witch, or at least has powers beyond the typical person. It's just a feeling I get from some of the things that have been said when describing their relationship. Though I could be wrong. After all, feelings aren't facts.
As for Barn and Liz, something is definitely going on between them in that photo. I love the way Pfeiffer is sort of looking at Depp through the corner of her eye. Though whether or not it's simply a moment staged purely for the camera (like the 1967 photo Gothick referred to) or depicting an actual moment from the film is anyone's guess at this point...
117 days 12 hours 32 minutes 32 seconds until the day the Depp/Burton Dark Shadows is released(ET)!!