I wish I had any advice to offer you, but I will certainly be following this in case anyone has some good suggestions.
I too have a very, very vocal little girl. I treat her whenever she's quiet and has stopped whining, so it puts some space between it... but really I've just accepted that she's just a vocal bratty girl, especially when she sees me getting out her food. I can only imagine how much more frustrating this becomes in a public setting.
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