You'd have thought by child no 3 I'd know what I was doing!
It's mainly directed towards her sisters and sometimes me when shes cross, angry or frustrated. I always pull her up on it and say no very firmly. Sometimes give her a warning that if she does it again x or y will happen which I follow through with. Occasionally I've lost my temper and smacked her which I know is the wrong thing to do and I'm not proud of it, but what worries me is that she immediately knows she's crossed the line. But I don't want to smack and there must be a better way.
Time out or equivalent wouldn't work because it often happens in the car so not really practical. Don't really want to faff around with stickers either.
What can I do? She often brings tears to the eyes of my older 2 dds and I want it to stop.