If you do end up losing your rag and telling her to get to her room you can't send her somewhere that has lots of toys, she's just going to think it's a party! I was told once by my mum that I flew into a rage and broke some of my toys, so she got really annoyed, got my favourite one and crush it right in front of my face! I was so shocked and gutted that the toy was broken that I didn't do that again, she said it was because it was broken on her terms, not on mine, that I minded, which sounds sensible. The fact that I then had no toys and she didn't replace them for a very long time also had an impact!
I actually remember two other things that she did to me, one was that I was always really greedy and never shared my food, we had chips from the chippy one day and she asked if she could have one, and I told her to go away and get off my chips! So she made me eat every single one of them, it was an adult portion and I was about 5. I was there for over three hours, they were manky and she made me eat every single one, I NEVER told her she couldn't have something of mine ever again!
The last one I remember was me thoroughly pushing her buttons in the car one day when she was driving, I was in the front seat opening and shutting the glove box, open shut open shut, she told me a number of times that I shouldn't do that because if she stopped suddenly I'd hit my head. Anyway in the end she got so pissed off that she stamped her foot on the brakes and shot me straight into the glove box, which of course hit my head! She said she felt really guilty afterwards but she never showed it, and I was as good as gold in the car since then!
Obviously I don't admit wounding your child, but sometimes you doing something totally unexpected is what will catch their attention, just asking and asking or shouting and shouting ends up becoming so normal that it has no effect at all.