About the same age as your DD! It really got to me - I caught the train to work one day and one of the mums from CC was on there, we chatted the whole way in. She more-or-less started the conversation with "it's been a rough year for you, with Pip's biting and hitting hasn't it". Had me in tears. Just keep the communication up with any carers / other parents etc. Other kids around Pip were taught to put up a hand in a "STOP" manner - as in "STOP - I don't like that" and that also helped.