I don't think just because you're not super open and happy about everything makes you come of as a "snobby *ehem* beyotch" at all. Not everyone is comfortable in those situations. I would probably come of as that because I don't take things lightly when they're hot topics and I don't think it's about being grateful tbh.
I don't think she's channeling Lisbeth (wearing Lanvin?) but I do think that becoming a character over a period of time makes you a different person in some way. I know how I feel 30 mins after I see a good film, I take something with me, feel with the character and the story and then imagine how they must feel! Also, this is probably her first role that's like this. Lisbeth's past and everything, it's a brutal story.
Love her short fringe. I'm usually a long fringe supporter but she looks great in that hairstye.