My sister-in-law keeps calling me 'your girlfriend,' and I want to smack her.

I'm asking for opinions here because I have nowhere else to go.

My husband is 4 years younger than me, so my sister-in-law is 2 years younger than me.

We've been dating for 5 years and married for over 2 years, but whenever my sister-in-law talks about me while on the phone with my husband, she's like, 'Your girlfriend?'

For example,

If he says, 'My wife bought me clothes today,' she'll ask,

'Your girlfriend? What did she buy you?'

It's always like that.

My husband gets mad, saying, 'We've been married for ages, why do you keep calling her my girlfriend?'

And then my sister-in-law always brushes it off with,

'Sorry, sorry, we dated for so long it's a habit. Sorry~'

It's the same at family gatherings. If I briefly leave the room, she'll ask my husband, 'Where'd your girlfriend go?' And then to my mother-in-law, 'Haven't seen your girlfriend around?' My mother-in-law doesn't say anything. I heard all of this from the bathroom.

She's over thirty, but her way of speaking still sounds like a middle schooler. She drinks often, so is her brain melting? Seriously, why is she like this? Should I confront her directly? I can't exactly punch her, seriously.

"쏘리쏘리 너네 오래사겨서 습관됐네 쏘리~"

이렇게 넘기고

가족모임있을때도 마찬가지로

제가 잠깐 자리비우면

남편한테 "니여친 어디갔냐?" 이러고

어머니한테는 "얘 여친 못봄?" 이러고

어머니도 별말안함

저는 화장실에있어서 다 들었거든요

나이가 서른이넘었는데

말투가 아직 중딩에서 못벗어난거같은

술을자주마시고다녀서 뇌가 녹은걸까요?

진짜왜이러는걸까요?

제가직접화를내야할까요?

확 팰수도없고진짜