From what I could gather she was annoyed that Johansson didn't do any chasing or anything of the earlier moves and was completely invisible until the attack that preceded Lizzie's. Which, when you consider that the final move consisted of 1xNED, 1xITA, 1xGBR and 1xSWE, is a moot point. Lizzie would argue that she got her teammates to do work making pace and controlling moves, and Emma would argue she didn't have many teammates to do that so it is only fair to hold on to the few she has and expect the strong teams like the Dutch and Italians to do that job as otherwise she's entering a battle short of weapons and outnumbered.
But then, I like Emma, and I'm not all that keen on Armitstead; as you say she does seem to blame others with some regularity (though she did put the blame back on herself later on for not learning from previous mistakes) and even it was exactly as per the team plan, the way she just rode up and over Pooley in her last race without even looking at her, let alone trying to work together, bothered me (but then as you can probably tell I was a big fan of Pooley's). I don't dislike her, but in most groups she's in at the end of races there's somebody I like more.