I am a CM to a little girl who is challenging me at the moment. She is 3 1/2 and is pushing the boundaries. Generally I try a very positive approach with her such as "If you sit nicely and eat your lunch then you'll get a sticker" rather than "no, don't run around - sit still" etc etc This tends to work and keeps her in a happy frame of mind.
The problem comes when she does something wrong. (This week she has put her hands around the 18 month old's neck and squeezed, as well as woken up two sleeping babies on purpose.) When she does this, if I tell her off I seem to start the "spiral of doom" where lots of unwanted behaviour follows. If I send her to time out/naughty step or similar she just grins at me and says "I like the step - I want to be here". If I say "I'll take your doll away and put her in your bag" she says "I don't want to play with it anyway". I have explained to her why I don't like what she has done, and when appropriate, why it is dangerous and what could happen but she just doesn't seem to care.
It seems to be a dominance/jealousy thing. She is only like it with the smallest children, rather than with any older or bigger than her. She has plenty of 1-1 time so it really isn't about lack of attention. I'm a bit stumped as to what to try. (The parents are lovely, but not particularly firm and seem shocked by some of the things she does, but don't have any suggestions .) Any ideas?