Question: Chocolate lab food aggressive?

I just got a purebred lab she is 10 weeks old and is food aggressive with my 3 year old lab what's the best way to stop that I've only had her two days so don't no if something like that will stop once she's used to her new home over time. And not sure what route to take to stop it she was never like that at her old home so the people said and she is fine with me I can stick my hand all in the bowl and even touch her moth while she's eaten no problem. Thanks for help and tips



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