Thanks for posting a link directly to the sandwich eating portion. It really is ...weird, in a way I can't quite express. Rickshaw's right that it is animalistic, as in feral. Ignoring the sandwich, pretending indifference, sniffing for danger, then attacking it, ripping off pieces of it with her giant hands or with her teeth, smacking loudly, going back to ignoring it until she attacks it again.
I've never seen anyone eat like that...
She was probably checking to make sure it wasn't laced with something that would make you tell the truth. Also, she picked the napkin out of the trash to make sure they didn't have her DNA?