What, what did she say? All this spluttering seems a very odd and disproportionate reaction to anything she just said and she frowns at Ianto, both startled and bemused. It doesn't take long for his amusement to palpably color the atmosphere, though by then she's already thrown off again by his question about the Doctor's... appearance? Really, that's what he took away from her discomfort with the whole situation? Humans.

"I'm not certain how you would quantify such an attribute?" she ventures, intensely confused. "He is... comparatively tall." Humans tend to assign cuteness to small things, don't they. Why is she even trying to answer this. "Honestly, why are you so amused?" she scolds, though underneath all the righteously confused indignation she's glad to see him experiencing positive emotions.