Just reinforce things, get her to look at you when you say Leave, then reward, by her looking at you, you will be getting her full attension if you get me, so she looks to you for reward rather than finding her own rewards, ie when Reece drops something
How old is she..
By doing things this way she is choosing to leave whatever rather than doing it because she is told to.
Glad my waffle makes sense, im better explaining in person ha ha.
xx

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Sarah xxx