Once she's chatting, she can't stop.
→   그녀는 한번채팅하면 멈추질않아.

[예문]
A:Dad! I hope you're not hungry.
  아빠,시장하지않으시길바래요.

B:Isn't dinner ready yet?
  저녁준비아직안되었어?

A:Not yet.Mom was very busy today.
  She was on the computer again.
네.오늘 엄마가 매우 바쁘세요.또 컴퓨터를 하셨거든요.

B:Was she chatting with her old high school friends?
  고등학교동창들하고 채팅하셨어?

A:Yes.Once she's chatting, she can't stop.
  What should we do, Dad?
 네.한번 채팅하시면 멈추시질않으세요.
 우리어떻게해요?

B:I think we should order pizza for dinner.
  저녁으로 피자시켜먹는것이 좋겠다