She lost all sympathy I might have had for her by her shallow matter-of-fact response to him after he shot him.
She could have done something to calm him down or gotten up to move.
She knew that he carried that gun with him and into that theatre and that he was working himself up to use it.
That's stretching it a bit, since apparently he has carried a gun most of his adult life and never used it before. So exactly how would she know he was working himself up to do something that he'd never done before?