Yes she will learn, but it will take time.The dog will also be picking up your sister's grief, so as long as she is grieving, then the dog will too.

Such terrible news, I am so sorry. I would be deverstated if it were one of mine. Please convey this to your sister.

If not already done you should report the owners x

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Lilly, Max, Henry and Sammy. The joys of my life!