Hi, my friend - no, really, it is my friend, she's just not a member of Mumsnet (yet) - is in a bit of a pickle with her daughter who is absolutely lovely most of the time but has these strange episodes where she is really defiant, rude, physically and verbally aggressive and threatens to have her mother jailed in moments of high anger: but then, insists, absolutely INSISTS, when it is all over, that it wasn't her and that it was 'somebody else'. Indeed, "another me". Plus she says she "wasn't there", "didn't do that" and genuinely thinks that it was not her, dissolves into tears saying: 'it wasn't me, why won't you believe me?" It's really sad and strange. She's such a lovely little one, and the parents are baffled. Any ideas?