Hi I have a 3 year old DD who recently has started constantly pushing, hitting and snatching from her 1 year old sister. I was using 123 magic (version of the naughty step with warnings) which worked well until recently. Now nothing seems to have much effect - time out, telling off, ignoring her while fussing over DD2. She has also started doing this when we are out and about so is not just attention seeking from me (though think there is still a big element of this).
I feel I'm getting into a bit of a negative pattern with her and would like to try some sort of star chart system (it worked well with her for potty training)or other positive reinforcement. However, I don't know how to define the behaviour I want to reward. She's too young to say "if you're not nasty to DD2 all morning you get a star" as that's too long a time. However, I don't want to reward her when she's nice to DD2 - they're by no means mutually exclusive with her - in fact being mean to DD2 often escalates from playing nicely together. I would end up with a situation where she had plenty of stars, but was still slapping DD2 about.
Any ideas from anyone.