Hermione still hadn't quite got her head around being called Lady, but all the house-elves she'd met at the Palace insisted on it. Unless they were calling her Master Harry's favouritest witch. That was their other personal name for her and was guaranteed to make her blush furiously, so the older elves tended to refrain from it, fearful they were making her ill. The younger ones were more playful and did it just to set them all to wild giggles.