A girl joined dd's class from another class in the same year about a year ago. Initially dd and her were friendly, but over the last couple of months the girl has become increasingly unpleasant. Not a day seems to go by when she won't call dd dumb/an idiot/stupid, make fun of her in front of others, accuse dd of being horrible to her when dd has done nothing... I'm not sure how to handle it, so far I have always told dd to just ignore it, and dd is very good at that but is finding it harder as time goes on. The teachers love this girl. The parents are lovely but have no idea what their dd is doing I think.
They are in year five.