Ryask is right - you can offer advice (it helps if you start it with asking if it's okay), but in the end she's an adult and will make her own decisions. The hardest part is to not beat yourself up if she makes bad choices. I was told once that it's okay to love someone even if you can't approve of their behaviors. Be strong.
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"Better not look down, if you want to keep on flying
Put the hammer down, keep it full speed ahead
Better not look back, or you might just wind up crying
You can keep it moving, if you don't look down" - B.B. King
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