Kids love to imitate but as kids' nature goes, they cannot seat still :-) I guess you would really have to be firm with her that eating time she needs to be in her booster and need to finish or at least concentrate on her eating. There should be consistency. If you allow her out of her booster, she sees the weakness there. So be firm and consistent. She may scream and cry that she wants out of the booster but eventually she will get used to this mealtime routine.
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