It wasn't that she was consciously trying to inflict pain upon him, it was just that she was so incredibly confused by their entire situation. Ana wasn't used to having anyone other than Ava care about her, or even have someone admit to her that they were falling for her. On top of being strange and new to her, it was also rather scary.
They had indeed stopped yelling after the hit to his head, but as soon as Adam set off to find a stronger drink, Ana's expression soured once more. "That's it?" she asked increduously with a raise of her eyebrow. The bloodlust was still rearing its ugly head inside her, but right now, annoyance was winning once more.