Whilst I agree with you that this child needs to be told she cannot behave or speak to anyone never mind he r Granma , the Doctor is correct and it is because they dont see each other very often the child thinks its okay to behave like this, and no one is correcting her Granma should sit her down and ask her why she is so rude to her,maybe they could get some rapport going ,ask WHY, and Mom of Daughter step up and do some ticking off.