Luckily Brigitta is horrifically bad at picking up on facial expressions; or else Kaylee might be doing skipping or running or some form of exercise right that moment- oh the sheer scariness of a exercise obsessed person' indeed, there are few things that compare to the levels of fear in that sort of thing.

"D'you?" And her eyes have gone slightly shiny "fruit is yummy... Y'don't mind or anything? I wouldn't want to steal after all."

Meaning: she wouldn't care in most situations but Kaylee is nice so she supposes she can be nice for a bit.