How do you proceed havinga stupid friend?

My friend, sorry to say, is an idiot who doesn't cars about her own safety.

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I'm not proceeding in confrontation and after I told her what she is doing is on safe and she tried to justify why she does it so I just said "okay". She asked me for help twice this week and it all went to shit because of her unsafe practice.
How do you proceed havinga stupid friend?
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