OK so she doesn't throw herself on the floor and howl like a toddler but she might as well!
When she loses her temper she is quite unable to stop herself. It usually starts with something little, then a reprimand, then she answers back/shouts at us/hits her sister/etc. until she gets sanctioned for it. The trouble is, we have never yet found any sanction which will stop her behaviour. She seems quite unable to get control of herself - or maybe she just doesn't care.
Sanctions typically include - count to 3 then she's on the stair/no swim club tonight/no computer time. Today she missed out on going horse riding as she just kept shouting at us.
I think part of the problem is that she is stubborn (family trait, not my family ha ha), part is that she lacks emotional intelligence (not able to put herself in other people's place, and see what they want from her), and partly she doesn't care if she's sanctioned (she generally doesn't have strong wants and desires that we can work with).
Any ideas?