Should i give up on my best friend?

So im 13 and my best friend is also 13... well idk our status right now because we've been drifting apart and i dont know what we call each other anymore. well yesterday she posted a picture of herself smoking on facebook.. -____- i was pissed off so i commented on it saying why are you being so stupid why are you hurting yourself? and if you knew you were gonna get hate messeges and explain everything to me then why did you put it on facebook?? i mean i know i dont know your problems right now but you dont have to do it this way i mean theres other ways... and we continued fighting on the comment boxes... she was telling me why she did it telling me all her problems that she incountered and that she would stop one day when all her problems dissappear but i told her what if they dont? are you gonna rely on smoking? why are you running away from your problems instead of facing them? your gonna regret this one day and i dont want that to happen to you... and then she told me if i do get lung cancer ill just sucide... -______-' at this point i was already pissed off but why would she say she'll just sucide i mean a life is so important then we kept fighting about it and other people started talking to her too and i guess she got to overwhelmed and she deleted the photo.... my friends told me to just give up on her and that she's a lost hope but i dont wanna i mean even though we're not close anymore she's still a very important person to me... what should i do?? should i just i give up?? i really dont wanna lose her but theres only so much i can do... Did i make the wrong choice by fighting with her? this was the first time in a long time we had a conversation tooo... am i a bad friend because i couldn't keep her away from smoking?