12 year old niece trying to flirt with husband?

I noticed when my husband calls me a brat my niece will say I’m a brat too. I don’t understand this behavior. Also my husband calls me and him beauty and the beast and then my niece goes I’m a beauty. What is this about? I’m not sure if it’s flirting or not but it’s kind of embarrassing. Is this normal? Me and her been close since she was born and I love her so much. How to stop this weird behavior?
12 year old niece trying to flirt with husband?
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