The original poster, whose parenting skills are, according to her, irreproachable, makes me feel ill with her threat to send her little girl away just to make her behave. She might as well cut out the stuff about the NGS and say 'if you don't behave/do what I want, Mummy won't love you any more'.
I'm an older mum, and I grew up in fear of my father who was a remote figure who, although he loved us, was unable to show it. Many, many times, I, as a little girl, tried so hard to please him through good behaviour, and it was never quite enough. Many times, I cried myself to sleep over his harsh words or looks.
So.......the though that my mother would ever have threatened me with the withdrawal of her love, (which she never did) even now makes me ill.
Please, please don't do this to your child. She loves you unconditionally and while her behaviour may not be all you would want, she needs to know that you will always love her whatever.