shefampyr
Even in that other clip she is a pretty crappy actress. It just seems forced and awkward.
I've seen pictures of her in magazines on the red carpet and there is something off about her. Like she doesn't know what the hell she's doing. Completely awkward.
Watch the entirety of
The Runaways or other movies that she's been in before deciding that she's not good at her job. The clips that have been posted don't do the movie justice and, as others have said, she didn't have much to work with playing Bella. It's a bit hard to seem comfortable and totally there while playing a piece of cardboard.
As a last thought here: pictures in magazines, really? That's even less fair to an actress than basing their entire career on one character.