DD1 has just started kicking everything in anger, she is normally such a quiet, placid girl but if she doesn't get her own way the furniture takes a hit, she has even swung at me a couple of times.

Dare say, afterwards she spends in time out and doesn't come back until she has apologized, nothing much you can do besides that. I don't believe in smacking in that situation cause I think it send the wrong message.