This usually happens when the child is used to having her way. I know the Western world regulates Child discipline but the child needs to be denied some certain things and corrected in love.

Here in Nigeria, a kid will dare not talk to a parent rudely, parents do not take Child discipline lightly😂. Even as an adult, i feel a pang in my chest whenever i want to talk back at my Mum.

I hope your friend can be able to correct this now..