她爹：“你謝謝阿姨沒？”小姑娘很可愛的說：“謝謝阿姨”That's good.

Then 她爹：“跟阿姨說，阿姨你真漂亮。”That's flirting, the girl doesn't like it. I think it's normal that a girl doesn't like her dad flirts around.

If it's her mom said “跟阿姨說，阿姨你真漂亮。”, it's perfectly fine. A man did that when wife is not around, not good.

I know my wife wouldn't like it.