If shes contemplating suicide. Stay with her as much as you can. Keep reasuuring her she can do better. Because the more you go on the more its an excuse to want coke..then when it wears off she will feel down and suicidal… your brain is that clever.. because shes had coke it wants more and you dont know.. you will start arguments for no reason.. start thinking about other things that lead to it…next min your on to you dealer.. and your brains won.. its called emotional relapse.. and she needs to avoid these trigger points. Im no expert at this but if it was my little girl.. id be keeping a close eye on her.. giving her positive advice. Making her aware of this crap stuff coke and how bad it is. And shes got her future ahead of her. And most of all she needs friends that dont touch the stuff.